You searched for subject:(Subsea).
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Texas A&M University
1.
Collette, Eric Peter.
Subsea Kick Detection on Floating Vessels: A Parametric Study.
Degree: MS, Petroleum Engineering, 2013, Texas A&M University
URL: http://hdl.handle.net/1969.1/151098 
► Well control in drilling operations is priority to personnel safety. Detection of kicks, or the unscheduled entry of formation fluids into the wellbore, is vital…
(more)
▼ Well control in drilling operations is priority to personnel safety. Detection of kicks, or the unscheduled entry of formation fluids into the wellbore, is vital to well control. It has been determined that return flow rate is the parameter most sensitive to detecting kicks and lost circulation. One kick detection method associated with this parameter is delta flow early kick detection or simply the delta flow method. This method has limitations on floating vessels. Inaccurate readings can occur due to the heave motion of a vessel. This is a result of the sensor being downstream of the compensatory slip joint. Expansion and compression of this joint can result in return flow readings that are not representative of the actual value. Inaccurate readings could create situations in which a false kick or false lost circulation is detected. Other inaccurate readings could result in an actual kick or lost circulation situation not being detected. In the past, work has been done to address this by developing a sensor that adjusts for heave. This work supports a project aimed at removing the need for motion compensation by relocating the sensor to a location independent of this motion.
A company is currently developing a delta flow early kick detection sensor to be placed at or near the seafloor. The stationary location of this sensor aims to remove the inaccuracy caused by slip joint compensation of vessel movement. This work will consist of a parametric study on the relationship of various drilling system and kick parameters at the seafloor using a well control simulator. The goal is to understand these relationships and determine the delta flow accuracy required based on a given kick size. As a result, this study found that a sensor capable of detecting a 10 barrel kick would require an accuracy of 2.4% and a 20 barrel kick would require a 4.6% accuracy for detection. This case was a shallow water, low kick intensity scenario. This accuracy and the others reported for the drilling and kick parameter ranges provide the boundaries for a well control sensor to be placed at the seafloor.
Advisors/Committee Members: Schubert, Jerome J (advisor), Teodoriu, Catalin (committee member), Aubeny, Charles (committee member).
Subjects/Keywords: Well Control; Subsea
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APA (6th Edition):
Collette, E. P. (2013). Subsea Kick Detection on Floating Vessels: A Parametric Study. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151098
Chicago Manual of Style (16th Edition):
Collette, Eric Peter. “Subsea Kick Detection on Floating Vessels: A Parametric Study.” 2013. Masters Thesis, Texas A&M University. Accessed January 23, 2021.
http://hdl.handle.net/1969.1/151098.
MLA Handbook (7th Edition):
Collette, Eric Peter. “Subsea Kick Detection on Floating Vessels: A Parametric Study.” 2013. Web. 23 Jan 2021.
Vancouver:
Collette EP. Subsea Kick Detection on Floating Vessels: A Parametric Study. [Internet] [Masters thesis]. Texas A&M University; 2013. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1969.1/151098.
Council of Science Editors:
Collette EP. Subsea Kick Detection on Floating Vessels: A Parametric Study. [Masters Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151098
University of Plymouth
2.
Szyrowski, Tomasz.
An intelligent, fast-acquisition remote sensing system for locating and measuring burial of subsea power and telecommunication cables.
Degree: PhD, 2017, University of Plymouth
URL: http://hdl.handle.net/10026.1/9588
► This thesis describes novel methods to localise and estimate the burial depth of subsea cables. The limitation of the current methods is that they can…
(more)
▼ This thesis describes novel methods to localise and estimate the burial depth of subsea cables. The limitation of the current methods is that they can measure the distance to the cable only in a small vicinity, usually up to three metres. The enhancements of the methods were investigated. The output from Neural Network algorithms was tested for its ability to enlarge the detection range and increase its precision. Following traditional methods, a new approach based on system identification and modelling was inspected. Various models were proposed and enhanced with Kalman filtering for linear models and unscented Kalman filtering for nonlinear models. In the case of subsea cable tracking, Kalman filtering requires precise knowledge of the system dynamics and associated stochastic processes. These requirements are often difficult to satisfy. To overcome this limitation this thesis proposes a novel and effective algorithm based on particle filtering. The proposed novel approach uses the whole set of sample points collected from the surface above the subsea cable. The algorithm based on a batch of samples allows to eliminate effectively the noise of the readings and estimate the position of the cable from larger distances than the current methods can do. The novel batch particle filter was implemented in different applications. Depending on the survey requirements and set-up, the method can be used on a single survey line or applied to the area covered by the survey and estimate the three-dimensional section of the cable. The algorithm was tested in a simulation of tracking by an autonomous surface vehicle. Finally, the market analysis for commercialisation of the method was conducted and a new prototype was proposed. The batch particle filter was tested on experimental data collected in different locations. The results demonstrate that the method is both practical and feasible and can successfully estimate the position of the subsea cable in shallow water.
Subjects/Keywords: 621.382; subsea cable
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APA (6th Edition):
Szyrowski, T. (2017). An intelligent, fast-acquisition remote sensing system for locating and measuring burial of subsea power and telecommunication cables. (Doctoral Dissertation). University of Plymouth. Retrieved from http://hdl.handle.net/10026.1/9588
Chicago Manual of Style (16th Edition):
Szyrowski, Tomasz. “An intelligent, fast-acquisition remote sensing system for locating and measuring burial of subsea power and telecommunication cables.” 2017. Doctoral Dissertation, University of Plymouth. Accessed January 23, 2021.
http://hdl.handle.net/10026.1/9588.
MLA Handbook (7th Edition):
Szyrowski, Tomasz. “An intelligent, fast-acquisition remote sensing system for locating and measuring burial of subsea power and telecommunication cables.” 2017. Web. 23 Jan 2021.
Vancouver:
Szyrowski T. An intelligent, fast-acquisition remote sensing system for locating and measuring burial of subsea power and telecommunication cables. [Internet] [Doctoral dissertation]. University of Plymouth; 2017. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10026.1/9588.
Council of Science Editors:
Szyrowski T. An intelligent, fast-acquisition remote sensing system for locating and measuring burial of subsea power and telecommunication cables. [Doctoral Dissertation]. University of Plymouth; 2017. Available from: http://hdl.handle.net/10026.1/9588
Delft University of Technology
3.
Kosanunt, P. (author).
Fatigue analysis of subsea Jumper under external loads (steady current and earthquake).
Degree: 2015, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:3b496f97-490e-4cc6-9f78-8dd83282c76a
► In recent times, the oil and gas business has moved into unconventional reservoirs, especially in deep-water. One high-potential prospect was found in the deep-water area…
(more)
▼ In recent times, the oil and gas business has moved into unconventional reservoirs, especially in deep-water. One high-potential prospect was found in the deep-water area of Myanmar. A
subsea production system pilot project is planned for implementation in this area. One essential element of a
subsea system is a “
subsea jumper”. The main function is to interface between the
subsea tree and
subsea manifold. There are various
subsea jumper configurations used in the market. This thesis focuses primarily on the U-inverse shape jumper as a fundamental shape which gives
subsea jumper a flexible characteristic. A
subsea jumper that is used in a deep-water area is difficult to access for maintenance or repair. As such, it is essential to determine the reliability of a jumper system, especially thru fatigue failure analysis. The dynamic behaviors of a
subsea jumper at various load conditions need to be taken into account during the design phase. In general, a
subsea jumper system experiences many loads both internal and external, but there are only two key external loads, the steady sea current and earthquakes at designed area. These interesting factors are considered in this thesis. In order to be better understand the dynamic behaviors of a
subsea jumper under load conditions, it is important to first analyze the dynamic characteristics of the jumper itself. A U-inverse shape jumper can be modelled by connecting three “pipe conveying fluid model” (or Euler Bernoulli Beam + internal flow effect). This is called a “
subsea jumper model” or “Triple beam model”. This model gives the dynamic characteristics of a jumper in terms of “mode shape” and “natural frequency” in two vibration planes: inline and crossflow. The dynamic behavior of a
subsea jumper under a current load situation can be solved by using a wake oscillator model coupled with a
subsea jumper model. The results show that a mild sea current is able to dramatically induce jumper oscillation. This phenomenon is called Vortex induced vibration (VIV). It can occur in both crossflow VIV and inline VIV; however, for both cases of VIV, a
subsea jumper system is safe to operate under the designed current velocity (maximum current velocity is 0.832 m/s, based on a 100-year return value). In an earthquake load condition, the
subsea jumper model is coupled with an inertia load model (mass times acceleration). Two types of acceleration are considered in this thesis thru a sinusoidal model and simulation model. The first, sinusoidal model assumes that an earthquake is a continuous process with ground acceleration in a sinusoidal shape. It is used to analyze the dynamic behavior of a
subsea jumper in terms of “seismic response spectra”. The second, a simulation model defines an earthquake in more realistic way by considering an earthquake as a shock of high magnitude in a small period. This model is more suitable for fatigue analysis. It should be emphasized that a pure earthquake load is a rare occasion, as the current of the nearby seabed is always present. Thus, it is more…
Advisors/Committee Members: Metrikine, A. (mentor), Hendricks, M.A.N. (mentor), Qu, Y. (mentor).
Subjects/Keywords: fatigue; subsea jumper
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APA (6th Edition):
Kosanunt, P. (. (2015). Fatigue analysis of subsea Jumper under external loads (steady current and earthquake). (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:3b496f97-490e-4cc6-9f78-8dd83282c76a
Chicago Manual of Style (16th Edition):
Kosanunt, P (author). “Fatigue analysis of subsea Jumper under external loads (steady current and earthquake).” 2015. Masters Thesis, Delft University of Technology. Accessed January 23, 2021.
http://resolver.tudelft.nl/uuid:3b496f97-490e-4cc6-9f78-8dd83282c76a.
MLA Handbook (7th Edition):
Kosanunt, P (author). “Fatigue analysis of subsea Jumper under external loads (steady current and earthquake).” 2015. Web. 23 Jan 2021.
Vancouver:
Kosanunt P(. Fatigue analysis of subsea Jumper under external loads (steady current and earthquake). [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Jan 23].
Available from: http://resolver.tudelft.nl/uuid:3b496f97-490e-4cc6-9f78-8dd83282c76a.
Council of Science Editors:
Kosanunt P(. Fatigue analysis of subsea Jumper under external loads (steady current and earthquake). [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:3b496f97-490e-4cc6-9f78-8dd83282c76a
Texas A&M University
4.
Devegowda, Deepak.
An assessment of subsea production systems.
Degree: MS, Petroleum Engineering, 2005, Texas A&M University
URL: http://hdl.handle.net/1969.1/1630
► The decreasing gap between technology and the its applicability in the oil industry has led to a rapid development of deepwater resources. Beginning with larger…
(more)
▼ The decreasing gap between technology and the its applicability in the oil industry has led to a rapid development of deepwater resources. Beginning with larger fields where the chances of economic success are high, to marginal fields where project economics becomes a more critical parameter, the petroleum industry has come a long way.
However, the ever growing water depths and harsher environments being encountered are presently posing challenges to
subsea production. Being able to develop a field and then proceeding to ensure flow for the life of the field comprises many situations where the production equipment can fail and falter or through external factors, be deemed unavailable. Some of the areas where most of the current developments in
subsea production are being seen are in
subsea processing, flow assurance, long term well monitoring and intervention technologies areas that pose some of the biggest challenges to smooth operation in the deepwater environment.
This research highlights the challenges to overcome in
subsea production and well systems and details the advances in technology to mitigate those problems. The emphasis for this part of the research is on multiphase pumping,
subsea processing, flow assurance, sustained casing pressure problems and well intervention.
Furthermore, most operators realize a reduced ultimate recovery from
subsea reservoirs owing to the higher backpressure imposed by longer flowlines and taller risers. This study investigates the reasons for this by developing a global energy balance and detailing measures to improve production rates and ultimate recoveries. The conclusions from this energy balance are validated by simulating a deepwater field under various
subsea production scenarios.
Advisors/Committee Members: Scott, Stuart L. (advisor), Juvkam-Wold, Hans (committee member), Mercier, Richard (committee member).
Subjects/Keywords: Subsea; Deepwater
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APA (6th Edition):
Devegowda, D. (2005). An assessment of subsea production systems. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/1630
Chicago Manual of Style (16th Edition):
Devegowda, Deepak. “An assessment of subsea production systems.” 2005. Masters Thesis, Texas A&M University. Accessed January 23, 2021.
http://hdl.handle.net/1969.1/1630.
MLA Handbook (7th Edition):
Devegowda, Deepak. “An assessment of subsea production systems.” 2005. Web. 23 Jan 2021.
Vancouver:
Devegowda D. An assessment of subsea production systems. [Internet] [Masters thesis]. Texas A&M University; 2005. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1969.1/1630.
Council of Science Editors:
Devegowda D. An assessment of subsea production systems. [Masters Thesis]. Texas A&M University; 2005. Available from: http://hdl.handle.net/1969.1/1630
Delft University of Technology
5.
Snel, T.W. (author).
Composite shallow foundation for subsea structures.
Degree: 2016, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:5dd37abc-86e6-47bd-bf93-40ef119f0f3d
► An ventilated composite shallow foundation for subsea structures is designed. The ventilated grating configuration improves operability of the installation through the splash zone. By penetrating…
(more)
▼ An ventilated composite shallow foundation for subsea structures is designed. The ventilated grating configuration improves operability of the installation through the splash zone. By penetrating into the soil, the foundation provides sufficient bearing capacity due to the additional generated skin friction. Furthermore, the seabed landing is assessed and the deformation of the grating under different load cases is determined. Finally, a joining technique to attach the gratings to the steel structure is suggested.
Offshore and Dredging engineering
Marine & Transport Technology
Mechanical, Maritime and Materials Engineering
Advisors/Committee Members: Metrikine, A. (mentor), Hoving, J.S. (mentor), Rijneveld, H.P. (mentor), Van Dalen, K.N. (mentor).
Subjects/Keywords: composite; frp; grating; subsea
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APA (6th Edition):
Snel, T. W. (. (2016). Composite shallow foundation for subsea structures. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:5dd37abc-86e6-47bd-bf93-40ef119f0f3d
Chicago Manual of Style (16th Edition):
Snel, T W (author). “Composite shallow foundation for subsea structures.” 2016. Masters Thesis, Delft University of Technology. Accessed January 23, 2021.
http://resolver.tudelft.nl/uuid:5dd37abc-86e6-47bd-bf93-40ef119f0f3d.
MLA Handbook (7th Edition):
Snel, T W (author). “Composite shallow foundation for subsea structures.” 2016. Web. 23 Jan 2021.
Vancouver:
Snel TW(. Composite shallow foundation for subsea structures. [Internet] [Masters thesis]. Delft University of Technology; 2016. [cited 2021 Jan 23].
Available from: http://resolver.tudelft.nl/uuid:5dd37abc-86e6-47bd-bf93-40ef119f0f3d.
Council of Science Editors:
Snel TW(. Composite shallow foundation for subsea structures. [Masters Thesis]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:5dd37abc-86e6-47bd-bf93-40ef119f0f3d
Delft University of Technology
6.
De Wildt, W.N. (author).
Fatigue Analysis and Loading Scenarios of Steel Chain Links used for Subsea Rock Installation.
Degree: 2013, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:f1c0bd70-e67c-48fa-ac1c-532b3ce0ec73
► This study analyses the fatigue failure and the loading scenarios of steel chain links used for suspending a Flexible Fall Pipe during Subsea Rock Installation.…
(more)
▼ This study analyses the fatigue failure and the loading scenarios of steel chain links used for suspending a Flexible Fall Pipe during Subsea Rock Installation. For that purpose, OrcaFlex is used to evaluate and quantify the global loading conditions in the chain links during the Subsea Rock Installation process. In Ansys, a Finite Element Model is created which investigates the chain links on a local scale when subjected to the loading conditions from OrcaFlex. Further, through an analytical design process and fatigue testing experiments, fatigue curves are constructed under various conditions. As a result, a method has been established for predicting the fatigue damage factor over the length of the Flexible Fall Pipe chains for various conditions, inter alia water depth, wave height and rock installation rate. Fatigue was found mainly in the upper part of the Flexible Fall Pipe chains. The level of fatigue increases rapidly and further down the Flexible Fall Pipe with increasing working depth and wave height. Additionally, it was found that chain link rotations can increase the peak stresses and the effect is larger with a higher friction factor. For further study, it is recommended to verify the OrcaFlex model by means of tests in a towing tank and the established fatigue curves by means of further fatigue testing experiments.
Offshore and Dredging Engineering
Offshore Engineering
Mechanical, Maritime and Materials Engineering
Advisors/Committee Members: Metrikine, A. (mentor), Hendriks, M.A.N. (mentor), Romeijn, A. (mentor), Hoving, J.S. (mentor), Voormolen, J.R. (mentor).
Subjects/Keywords: fatigue; chain; links; subsea; fallpipe
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APA (6th Edition):
De Wildt, W. N. (. (2013). Fatigue Analysis and Loading Scenarios of Steel Chain Links used for Subsea Rock Installation. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:f1c0bd70-e67c-48fa-ac1c-532b3ce0ec73
Chicago Manual of Style (16th Edition):
De Wildt, W N (author). “Fatigue Analysis and Loading Scenarios of Steel Chain Links used for Subsea Rock Installation.” 2013. Masters Thesis, Delft University of Technology. Accessed January 23, 2021.
http://resolver.tudelft.nl/uuid:f1c0bd70-e67c-48fa-ac1c-532b3ce0ec73.
MLA Handbook (7th Edition):
De Wildt, W N (author). “Fatigue Analysis and Loading Scenarios of Steel Chain Links used for Subsea Rock Installation.” 2013. Web. 23 Jan 2021.
Vancouver:
De Wildt WN(. Fatigue Analysis and Loading Scenarios of Steel Chain Links used for Subsea Rock Installation. [Internet] [Masters thesis]. Delft University of Technology; 2013. [cited 2021 Jan 23].
Available from: http://resolver.tudelft.nl/uuid:f1c0bd70-e67c-48fa-ac1c-532b3ce0ec73.
Council of Science Editors:
De Wildt WN(. Fatigue Analysis and Loading Scenarios of Steel Chain Links used for Subsea Rock Installation. [Masters Thesis]. Delft University of Technology; 2013. Available from: http://resolver.tudelft.nl/uuid:f1c0bd70-e67c-48fa-ac1c-532b3ce0ec73
Texas A&M University
7.
Bai, Yanbin.
Analysis of Subsea Buried Pipelines and Partially Buried Cables.
Degree: PhD, Ocean Engineering, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/153835
► This research investigation addresses the analysis and numerical simulation of two very important offshore engineering problems. The first deals with the modeling of the steady…
(more)
▼ This research investigation addresses the analysis and numerical simulation of two very important offshore engineering problems. The first deals with the modeling of the steady state thermal field around buried pipelines conveying high temperature wellhead mixtures of oil and gas, and their associated dissolved impurities. These pipelines may be buried using robotic trenching equipment for physical protection or to provide additional thermal insulation. The solution to this complex multi-layer problem is examined using a boundary element model approach. The second challenging problem is that of modeling a partially buried cable on the seafloor that is ensnared by commercial fishing equipment. There are many cables on the seafloor and several obvious systems are oceanic communication cables and the increasing number of
subsea power transmission systems associated with the continuing development of offshore wind farms. In this problem an important numerical modeling challenge is to allow the cable to change its length as a result of the entanglement. A different approach is presented, i.e. a meshfree formulation, is specifically developed for simulating this type of
subsea cable problem.
A two-dimensional boundary element model was developed specifically to investigate the local steady-state thermal field in the near field of the pipeline. Subsequently, a parametric study was preformed to evaluate the influence of the thermal power loss, burial depth, pipe diameter and soil thermal conductivity on the thermal field. The numerical examples illustrate the significant influence of the backfill thermal property on the temperature at the pipe wall, that the pipe diameter controls the required output thermal power needed to maintain the desired pipe wall temperature, and the importance of pipeline burial depth on seabed temperature distribution above the pipeline.
In order to better address the problem of partially buried
subsea cables, a three dimensional meshfree method was formulated and implemented to evaluate the structural response of cables in two dimensional space under accidental loads from trawling activities. The methodology specifically was developed to allow the arbitrary layout of a cable on the seafloor, the lengthening of an ensnared cable length at a boundary, and the inclusion of geometrical nonlinearity due to large deflection. This meshfree method is based upon a slender rod formulation, incorporates radial basis functions (RBF) for shape function construction, and utilizes a Galerkin weak formulation for the discretization of governing equations. The methodology was validated against two benchmark examples which have analytical solutions, and shows good convergence rates to the analytical solutions. Finally, a two dimensional gear-cable example illustrating the adaptive nature of this formulation and implementation to address a sliding length boundary condition is presented.
Advisors/Committee Members: Niedzwecki, John M. (advisor), Zhang, Jun (committee member), Newton, Joseph (committee member), Sanchez, Marcelo (committee member).
Subjects/Keywords: thermal field; subsea buried pipeline; subsea buried cable
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APA (6th Edition):
Bai, Y. (2014). Analysis of Subsea Buried Pipelines and Partially Buried Cables. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153835
Chicago Manual of Style (16th Edition):
Bai, Yanbin. “Analysis of Subsea Buried Pipelines and Partially Buried Cables.” 2014. Doctoral Dissertation, Texas A&M University. Accessed January 23, 2021.
http://hdl.handle.net/1969.1/153835.
MLA Handbook (7th Edition):
Bai, Yanbin. “Analysis of Subsea Buried Pipelines and Partially Buried Cables.” 2014. Web. 23 Jan 2021.
Vancouver:
Bai Y. Analysis of Subsea Buried Pipelines and Partially Buried Cables. [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1969.1/153835.
Council of Science Editors:
Bai Y. Analysis of Subsea Buried Pipelines and Partially Buried Cables. [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153835
Delft University of Technology
8.
Rodermans, M.J. (author).
Hydrodynamic behavior of in-line structures.
Degree: 2016, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:85b601cc-8454-4686-afcb-2344ec752ac1
► Heerema Marine Contractors (HMC) is, amongst other activities, involved in the installation of subsea pipelines and subsea structures. In order to increase efficiency during production…
(more)
▼ Heerema Marine Contractors (HMC) is, amongst other activities, involved in the installation of subsea pipelines and subsea structures. In order to increase efficiency during production and installation these subsea structures are welded into the pipeline instead of installed separately. The presence of subsea structures in the pipeline increases the stresses in pipelines during installation. The stresses in pipelines during installation are analyzed beforehand. These analyses show that with subsea structures becoming bigger, the workability of in-line subsea structure installation becomes unacceptably low. In order to model the hydrodynamic forces acting on subsea structures simplified models are used. The suspicion is that these simplified models are conservative because of the lack of knowledge on the hydrodynamics around complex shaped structures. A first research on the behavior of in-line structure installation and the effects of alternative hydrodynamic loading models has been performed at HMC. On the basis of this research, questions remain. The most important ones are: • Is Morison’s equation applicable for sharp edged and asymmetric structures? • Can forced motion experiments be used to model the dynamic behavior of subsea structures? • Is the motion of sharp edged and asymmetric structures decoupled? This thesis is performed to investigate the hydrodynamics around subsea structures and answer these questions.. With the use of Dynamic Fluid Body Interaction (DFBI) simulations the dynamic behavior of sharp edged and asymmetric structures and the description of this behavior have been investigated. Subsea structures are simplified as thin flat plates and simulations in one and two degrees of freedom have been performed. Over a range of frequencies the behavior in regular oscillating flow has been investigated. From the research it can be concluded that over the range of Keulegan-Carpenter (KC) numbers associated with in-line subsea structure installation Morison’s equation can be used to describe forces accurately and these forces are decoupled. Further research should be performed on the hydrodynamic coefficients for subsea structures as the DNV GL prescribed coefficients cause large differences with the simulated behavior where KC dependent coefficients perform better. Hydrodynamic moments are observed which are not taken into account during installation analysis. The impact of these moments on the dynamic behavior of subsea structures should be further investigated.
Mechanical, Maritime and Materials Engineering
Offshore & Dredging Engineering
Advisors/Committee Members: Metrikine, A. (mentor).
Subjects/Keywords: Morison's Equation; CFD; DFBI; Hydrodynamics; Subsea structures
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Manager
APA (6th Edition):
Rodermans, M. J. (. (2016). Hydrodynamic behavior of in-line structures. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:85b601cc-8454-4686-afcb-2344ec752ac1
Chicago Manual of Style (16th Edition):
Rodermans, M J (author). “Hydrodynamic behavior of in-line structures.” 2016. Masters Thesis, Delft University of Technology. Accessed January 23, 2021.
http://resolver.tudelft.nl/uuid:85b601cc-8454-4686-afcb-2344ec752ac1.
MLA Handbook (7th Edition):
Rodermans, M J (author). “Hydrodynamic behavior of in-line structures.” 2016. Web. 23 Jan 2021.
Vancouver:
Rodermans MJ(. Hydrodynamic behavior of in-line structures. [Internet] [Masters thesis]. Delft University of Technology; 2016. [cited 2021 Jan 23].
Available from: http://resolver.tudelft.nl/uuid:85b601cc-8454-4686-afcb-2344ec752ac1.
Council of Science Editors:
Rodermans MJ(. Hydrodynamic behavior of in-line structures. [Masters Thesis]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:85b601cc-8454-4686-afcb-2344ec752ac1
9.
Huang, Shan.
Analysis and control of marine cable systems.
Degree: PhD, 1992, University of Strathclyde
URL: http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21240
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286137
► The thesis deals with systems consisting of marine cables and subsea units. Such systems have wide applications in offshore subsea operations. After a general introduction,…
(more)
▼ The thesis deals with systems consisting of marine cables and subsea units. Such systems have wide applications in offshore subsea operations. After a general introduction, the thesis sets out to analyse both the static and dynamic behaviours of the system under various environmental and operational conditions. It endeavours to pursue a fundamental approach in order to reveal the basic characteristics of the system, in addition to developing numerical algorithms for predicting performance. The analysis of behaviour of marine cables consists of the following parts: Statics A semi-analytic approach is developed to predict the equilibrium configurations of marine cables. One-dimensional dynamics Using a coordinate transformation, the method can predict the unsteady dynamic behaviour of systems where the length of cable varies. Two-dimensional dynamics The methodology adopted in the one-dimension analysis is extended to a more general case. Three-dimensional dynamics An alternative approach based upon a lumped mass model is developed. Mathematical analysis reveals many interesting characteristics of the model. By applying modern control theory, a novel heave compensation mechanism is developed for marine systems of cables and subsea units. This mechanism involves an actively controlled winch system. A framework of optimal stochastic control is outlined for integrating all the elements of surface supported subsea operations. The thesis presents a variety of numerical examples in domenstrating the validity of the approaches adopted, along with discussions. Further developments are also recommended.
Subjects/Keywords: 623.8; Subsea units
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APA (6th Edition):
Huang, S. (1992). Analysis and control of marine cable systems. (Doctoral Dissertation). University of Strathclyde. Retrieved from http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21240 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286137
Chicago Manual of Style (16th Edition):
Huang, Shan. “Analysis and control of marine cable systems.” 1992. Doctoral Dissertation, University of Strathclyde. Accessed January 23, 2021.
http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21240 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286137.
MLA Handbook (7th Edition):
Huang, Shan. “Analysis and control of marine cable systems.” 1992. Web. 23 Jan 2021.
Vancouver:
Huang S. Analysis and control of marine cable systems. [Internet] [Doctoral dissertation]. University of Strathclyde; 1992. [cited 2021 Jan 23].
Available from: http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21240 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286137.
Council of Science Editors:
Huang S. Analysis and control of marine cable systems. [Doctoral Dissertation]. University of Strathclyde; 1992. Available from: http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21240 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286137
Heriot-Watt University
10.
Kalorazi, Bahman Tohidi.
Gas hydrate equilibria in the presence of electrolyte solutions.
Degree: PhD, 1995, Heriot-Watt University
URL: http://hdl.handle.net/10399/1183
Subjects/Keywords: 553.282; Subsea pipelines
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APA (6th Edition):
Kalorazi, B. T. (1995). Gas hydrate equilibria in the presence of electrolyte solutions. (Doctoral Dissertation). Heriot-Watt University. Retrieved from http://hdl.handle.net/10399/1183
Chicago Manual of Style (16th Edition):
Kalorazi, Bahman Tohidi. “Gas hydrate equilibria in the presence of electrolyte solutions.” 1995. Doctoral Dissertation, Heriot-Watt University. Accessed January 23, 2021.
http://hdl.handle.net/10399/1183.
MLA Handbook (7th Edition):
Kalorazi, Bahman Tohidi. “Gas hydrate equilibria in the presence of electrolyte solutions.” 1995. Web. 23 Jan 2021.
Vancouver:
Kalorazi BT. Gas hydrate equilibria in the presence of electrolyte solutions. [Internet] [Doctoral dissertation]. Heriot-Watt University; 1995. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10399/1183.
Council of Science Editors:
Kalorazi BT. Gas hydrate equilibria in the presence of electrolyte solutions. [Doctoral Dissertation]. Heriot-Watt University; 1995. Available from: http://hdl.handle.net/10399/1183
Curtin University of Technology
11.
Machuca Suarez, Laura Lizeth.
Microbiologically influenced corrosion of common alloys used for subsea applications
.
Degree: 2012, Curtin University of Technology
URL: http://hdl.handle.net/20.500.11937/258
► This project has investigated the susceptibility of offshore construction steels to microbiologically influenced corrosion in seawater, elucidating the effects of temperature, oxygen pressure, exposure time…
(more)
▼ This project has investigated the susceptibility of offshore construction steels to microbiologically influenced corrosion in seawater, elucidating the effects of temperature, oxygen pressure, exposure time and alloy material composition on biological activity and the corrosion resistance of the selected materials in seawater. Results from this research form the foundations of essential guidelines for design criteria, risk assessment and asset integrity management based on materials selection and preservation treatments in the application to subsea equipment.
Subjects/Keywords: subsea equipment;
corrosion;
offshore construction steels;
common alloys;
seawater;
microbiologically influenced corrosion;
subsea applications
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APA (6th Edition):
Machuca Suarez, L. L. (2012). Microbiologically influenced corrosion of common alloys used for subsea applications
. (Thesis). Curtin University of Technology. Retrieved from http://hdl.handle.net/20.500.11937/258
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Machuca Suarez, Laura Lizeth. “Microbiologically influenced corrosion of common alloys used for subsea applications
.” 2012. Thesis, Curtin University of Technology. Accessed January 23, 2021.
http://hdl.handle.net/20.500.11937/258.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Machuca Suarez, Laura Lizeth. “Microbiologically influenced corrosion of common alloys used for subsea applications
.” 2012. Web. 23 Jan 2021.
Vancouver:
Machuca Suarez LL. Microbiologically influenced corrosion of common alloys used for subsea applications
. [Internet] [Thesis]. Curtin University of Technology; 2012. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/20.500.11937/258.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Machuca Suarez LL. Microbiologically influenced corrosion of common alloys used for subsea applications
. [Thesis]. Curtin University of Technology; 2012. Available from: http://hdl.handle.net/20.500.11937/258
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University College London (University of London)
12.
Jang, Young Sik.
Fluid loading and hydro-elastic response of towed pipelines.
Degree: PhD, 1996, University College London (University of London)
URL: https://discovery.ucl.ac.uk/id/eprint/10104818/
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243278
► As oil production moves to deeper water and marginal fields, it is necessary to critically consider the merits and drawbacks of different subsea pipelaying techniques.…
(more)
▼ As oil production moves to deeper water and marginal fields, it is necessary to critically consider the merits and drawbacks of different subsea pipelaying techniques. The pipeline tow method is one of these. The basic concept of the tow method is to tow and lay the pipeline at an off-shore location after joining and testing the system at an on-shore fabrication site. This method, therefore, assures improved production quality of pipelines and can be applied economically and easily to all kinds of pipe. It does, however, pose a greater risk of failure due to ocean wave loads during its towing phase. As a consequence, the tow method requires very careful design to achieve a very small submerged weight and maintain a nearly horizontal catenary that is then directly exposed to wave action. The physical problem of towed pipelines in currents and waves is exceedingly complex. The static component of the problem has a significant structural nonlinearity whereas the dynamic component is complicated by the quadratic nonlinearity of the hydrodynamic drag force and the unusual nature of the inertia force under a high near-tangential flow. Such an inertia force was first identified by Sir James Lighthill as applicable to circular cylinders with near- tangential incident flow in waves. The analysis must also account for the axial dynamics of the pipeline, towlines and the tow vessels. The research described in this thesis is aimed at investigating these issues and to obtain a quantitative understanding of their effects on the responses of typical towed pipelines. Initially, the governing equations for towed pipelines and the analytical solutions for simplified cases are presented. In order to tackle a full, representative problem, the finite element method (FEM) is used both for static and dynamic analysis. For the static analysis, full nonlinear algorithms are implemented for the pipeline with simple support boundary condition at each end. To improve convergence performance during this nonlinear analysis, an enhanced catenary equation, which can consider the effect of a uniform normal component of current load, is used to obtain an initial configuration for the nonlinear analysis. To consider deformation-dependent loading from currents and hydrostatic pressure, an improved version of the direct iteration method is applied using a conventional inner iteration approach with constant external load and an outer iteration to ensure that the residual forces resulting from the deformation-dependent loading are equilibrated. Both tow vessels and towlines are added to the static analysis model to form a dynamic analysis model with the initial stiffness method being employed during a direct integration procedure. The dynamic analysis is done in the time domain for regular waves with either the Morison equation or Lighthill's inertia loading formulation. The results from this complete FEM are verified by comparison with those from another finite element package (ABAQUS) for simplified models. The results show that towed pipelines are…
Subjects/Keywords: 532; Subsea pipelaying; Dynamic analysis
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APA (6th Edition):
Jang, Y. S. (1996). Fluid loading and hydro-elastic response of towed pipelines. (Doctoral Dissertation). University College London (University of London). Retrieved from https://discovery.ucl.ac.uk/id/eprint/10104818/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243278
Chicago Manual of Style (16th Edition):
Jang, Young Sik. “Fluid loading and hydro-elastic response of towed pipelines.” 1996. Doctoral Dissertation, University College London (University of London). Accessed January 23, 2021.
https://discovery.ucl.ac.uk/id/eprint/10104818/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243278.
MLA Handbook (7th Edition):
Jang, Young Sik. “Fluid loading and hydro-elastic response of towed pipelines.” 1996. Web. 23 Jan 2021.
Vancouver:
Jang YS. Fluid loading and hydro-elastic response of towed pipelines. [Internet] [Doctoral dissertation]. University College London (University of London); 1996. [cited 2021 Jan 23].
Available from: https://discovery.ucl.ac.uk/id/eprint/10104818/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243278.
Council of Science Editors:
Jang YS. Fluid loading and hydro-elastic response of towed pipelines. [Doctoral Dissertation]. University College London (University of London); 1996. Available from: https://discovery.ucl.ac.uk/id/eprint/10104818/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243278
University of Miami
13.
Trillo, Marcia L.
The Effects of Dispersants on the Spatiotemporal Distribution of Hydrocarbons: Insights from the Gulf Science Data on the Nature of the Macondo Blowout.
Degree: MS, Applied Marine Physics (Marine), 2017, University of Miami
URL: https://scholarlyrepository.miami.edu/oa_theses/669
► During the Deepwater Horizon accident in 2010, oil spilled into the Gulf of Mexico and approximately 770,000 gallons of chemical dispersants were injected directly…
(more)
▼ During the Deepwater Horizon accident in 2010, oil spilled into the Gulf of Mexico and approximately 770,000 gallons of chemical dispersants were injected directly at the Macondo wellhead attempting to keep the oil submerged. Despite conducting thorough research in the past seven years, a detailed empirical analysis as the oil was spewing from the wellhead and after the well capping, has not yet been completely undertaken. Recently, BP made available a unique dataset (“Gulf Science Data”) of oil samples collected from May 2010 to July 2012. In this research, we examine this comprehensive dataset to determine the spatial-temporal distribution of the chemical signature of Macondo oil up to December 2010. We also analyze the hydrocarbon chemical data depending on the variable dispersant application period to provide an exhaustive sub-sea dispersant injection (SSDI) analysis. Additionally, the Gulf Science dataset is also used to investigate the role of Earth’s rotation on the plume dynamics. Our spatial data results confirm the presence of the so called “deep-plume” (i.e. a dominant intrusion layer centered around 1,100 m). The SSDI robust linear regression analysis reveals no significant differences on the vertical structure of the oil plume with variable dispersant injection, ranging from no dispersant to ca. 22,000 gal/day, thus questioning the effects of SSDI for deep-sea oil spills. Despite inhomogeneous sampling, the comprehensive BP Gulf Science Data sheds some light on understanding the nature of deep blowouts and required responses.
Advisors/Committee Members: Claire B. Paris, M. Josefina Olascoaga, Zachary Aman.
Subjects/Keywords: Subsea Dispersant Injection; Gulf Science Data; Deepwater Horizon; Oil Spill
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APA (6th Edition):
Trillo, M. L. (2017). The Effects of Dispersants on the Spatiotemporal Distribution of Hydrocarbons: Insights from the Gulf Science Data on the Nature of the Macondo Blowout. (Thesis). University of Miami. Retrieved from https://scholarlyrepository.miami.edu/oa_theses/669
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Trillo, Marcia L. “The Effects of Dispersants on the Spatiotemporal Distribution of Hydrocarbons: Insights from the Gulf Science Data on the Nature of the Macondo Blowout.” 2017. Thesis, University of Miami. Accessed January 23, 2021.
https://scholarlyrepository.miami.edu/oa_theses/669.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Trillo, Marcia L. “The Effects of Dispersants on the Spatiotemporal Distribution of Hydrocarbons: Insights from the Gulf Science Data on the Nature of the Macondo Blowout.” 2017. Web. 23 Jan 2021.
Vancouver:
Trillo ML. The Effects of Dispersants on the Spatiotemporal Distribution of Hydrocarbons: Insights from the Gulf Science Data on the Nature of the Macondo Blowout. [Internet] [Thesis]. University of Miami; 2017. [cited 2021 Jan 23].
Available from: https://scholarlyrepository.miami.edu/oa_theses/669.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Trillo ML. The Effects of Dispersants on the Spatiotemporal Distribution of Hydrocarbons: Insights from the Gulf Science Data on the Nature of the Macondo Blowout. [Thesis]. University of Miami; 2017. Available from: https://scholarlyrepository.miami.edu/oa_theses/669
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Houston
14.
-2078-0687.
Estimation of Wax Deposition in Subsea Pipelines.
Degree: MS, Mechanical Engineering, 2017, University of Houston
URL: http://hdl.handle.net/10657/5689
► Developed is a multi-physics low dimensional model forecasting wax deposition rate within subsea production pipelines. This research employs experiments from 1-D and 2-D multiphase flow…
(more)
▼ Developed is a multi-physics low dimensional model forecasting wax deposition rate within
subsea production pipelines. This research employs experiments from 1-D and 2-D multiphase flow that have been successfully matched by a combined physics model on a closed-loop structure where the measuring length was 2.5m and the pipe inside diameter 0.0144m. The wax precipitation factor correlations used in 1-D and 2-D wax deposition models are valid only for 1-phase flows. Thus, to apply the 2-phase flow along these models the import of a coefficient is applied, directly related to the Gas Volume Fraction. Finally, there is a simulation that validates the model for 1-D, 1-phase closed loop system and a simulation for 1-D, 2-phase closed loop system. Then, the model is applied on a
subsea pipeline for 1-D, 1-phase for a pipe of 0.305m ID, 80km long and for 2-D, 2-phase separately for a pipeline of same ID, 100m and 1000m long.
Advisors/Committee Members: Franchek, Matthew A. (advisor), Grigoriadis, Karolos M. (committee member), Vipulanandan, Cumaraswamy (committee member).
Subjects/Keywords: Oil; Wax; Subsea; Deposition; Diffusion; Solubility; Phase; Flow
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APA (6th Edition):
-2078-0687. (2017). Estimation of Wax Deposition in Subsea Pipelines. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/5689
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-2078-0687. “Estimation of Wax Deposition in Subsea Pipelines.” 2017. Masters Thesis, University of Houston. Accessed January 23, 2021.
http://hdl.handle.net/10657/5689.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-2078-0687. “Estimation of Wax Deposition in Subsea Pipelines.” 2017. Web. 23 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-2078-0687. Estimation of Wax Deposition in Subsea Pipelines. [Internet] [Masters thesis]. University of Houston; 2017. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10657/5689.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-2078-0687. Estimation of Wax Deposition in Subsea Pipelines. [Masters Thesis]. University of Houston; 2017. Available from: http://hdl.handle.net/10657/5689
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
University of Houston
15.
Meziou, Amine.
Low-Dimensional Modeling of Two-Phase Flow in Pipelines.
Degree: PhD, Mechanical Engineering, 2017, University of Houston
URL: http://hdl.handle.net/10657/4623
► Multiphase flow in pipelines is an ubiquitous part of any oil and gas production system. Developing fast, yet accurate multiphase flow models having utility in…
(more)
▼ Multiphase flow in pipelines is an ubiquitous part of any oil and gas production system. Developing fast, yet accurate multiphase flow models having utility in system design, control design, and system health-monitoring is therefore an important engineering and scientific challenge, particularly when the pipelines are parts of a complex
subsea architecture.
Presented in this dissertation are multi-physics reduced-order fluid and thermal models of one-dimensional transient two-phase flow in pipelines. The proposed fluid model is comprised of a steady state multiphase flow mechanistic model in series with a transient reduced-order single-phase flow model. The low-dimensional model parameters are realized by developing equivalent fluid properties (i.e., viscosity, density and bulk modulus) that are a function of the flow pattern, steady-state pressure gradient, and liquid holdup identified through the mechanistic model. The fluid model is then coupled with a two-phase flow heat transfer model via a multi-physics integration block used to update the fluid properties along the pipeline based on the predicted pressure and temperature conditions. The model ability to reproduce the dynamics of multiphase flow in pipes is first evaluated upon comparison to OLGA. The two models show a good agreement of the steady-state response and the period of oscillation indicating a similar estimation of the pipeline natural frequency. However, they present a discrepancy in the overshoot values and the settling time due to a difference in the calculated damping ratio. Both models are then compared to transient two-phase flow data collected at the National University of Singapore flow loop. It is concluded that the low-dimensional model is characterized by a superior overall performance when compared to OLGA. The developed model accuracy improves when considering a higher order but is associated with a higher simulation time. The established multi-physics models are used for the design, modeling, simulation, and optimization of multiple-wells
subsea architectures with a High Integrity Pressure Protection System (HIPPS) as an alternative to reduce the
subsea capital expenditure (CAPEX).
The utility of the developed low-dimensional models is the reduced computational burden of estimating transient multiphase flow in pipelines, thereby enabling real-time estimation of pressure, temperature, and flow rate.
Advisors/Committee Members: Franchek, Matthew A. (advisor), Grigoriadis, Karolos M. (committee member), Song, Gangbing (committee member), Nikolaou, Michael (committee member), Provence, Robert S. (committee member).
Subjects/Keywords: Multi-phase flow; Pipelines; Transient; Steady-state; Subsea; Fluid dynamics; Thermal
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APA ·
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Export
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APA (6th Edition):
Meziou, A. (2017). Low-Dimensional Modeling of Two-Phase Flow in Pipelines. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/4623
Chicago Manual of Style (16th Edition):
Meziou, Amine. “Low-Dimensional Modeling of Two-Phase Flow in Pipelines.” 2017. Doctoral Dissertation, University of Houston. Accessed January 23, 2021.
http://hdl.handle.net/10657/4623.
MLA Handbook (7th Edition):
Meziou, Amine. “Low-Dimensional Modeling of Two-Phase Flow in Pipelines.” 2017. Web. 23 Jan 2021.
Vancouver:
Meziou A. Low-Dimensional Modeling of Two-Phase Flow in Pipelines. [Internet] [Doctoral dissertation]. University of Houston; 2017. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10657/4623.
Council of Science Editors:
Meziou A. Low-Dimensional Modeling of Two-Phase Flow in Pipelines. [Doctoral Dissertation]. University of Houston; 2017. Available from: http://hdl.handle.net/10657/4623
Cranfield University
16.
Okonji, Stephen Chiedu.
Multi criteria risk analysis of a subsea BOP system.
Degree: PhD, 2015, Cranfield University
URL: http://dspace.lib.cranfield.ac.uk/handle/1826/11869
► The Subsea blowout preventer (BOP) which is latched to a subsea wellhead is one of several barriers in the well to prevent kicks and blowouts…
(more)
▼ The Subsea blowout preventer (BOP) which is latched to a subsea wellhead is
one of several barriers in the well to prevent kicks and blowouts and it is the
most important and critical equipment, as it becomes the last line of protection
against blowout. The BOP system used in Subsea drilling operations is
considered a Safety – Critical System, with a high severity consequence
following its failure. Following past offshore blowout incidents such as the most
recent Macondo in the Gulf of Mexico, there have been investigations, research,
and improvements sought for improved understanding of the BOP system and
its operation. This informs the need for a systematic re-evaluation of the Subsea
BOP system to understand its associated risk and reliability and identify critical
areas/aspects/components.
Different risk analysis techniques were surveyed and the Failure modes effect
and criticality analysis (FMECA) selected to be used to drive the study in this
thesis. This is due to it being a simple proven cost effective process that can
add value to the understanding of the behaviours and properties of a system,
component, software, function or other. The output of the FMECA can be used
to inform or support other key engineering tasks such as redesigning, enhanced
qualification and testing activity or maintenance for greater inherent reliability
and reduced risk potential. This thesis underscores the application of the
FMECA technique to critique associated risk of the Subsea BOP system.
System Functional diagrams was developed with boundaries defined, a FMECA
were carried out and an initial select list of critical component failure modes
identified. The limitations surrounding the confidence of the FMECA failure
modes ranking outcome based on Risk priority number (RPN) is presented and
potential variations in risk interpretation are discussed.
The main contribution in this thesis is an innovative framework utilising
Multicriteria decision making (MCDA) analysis techniques with consideration of
fuzzy interval data is applied to the Subsea BOP system critical failure modes
from the FMECA analysis. It utilised nine criticality assessment criteria deduced
from expert consultation to obtain a more reliable ranking of failure modes. The MCDA techniques applied includes the technique for order of Preference for
similarity to the Ideal Solution (TOPSIS), Fuzzy TOPSIS, TOPSIS with interval
data, and Preference Ranking Organization Method for Enrichment of
Evaluations (PROMETHEE). The outcome of the Multi-criteria analysis of the
BOP system clearly shows failures of the Wellhead connector, LMRP hydraulic
connector and Control system related failure as the Top 3 most critical failure
with respect to a well control. The critical failure mode and components
outcome from the analysis in this thesis is validated using failure data from
industry database and a sensitivity analysis carried out. The importance of
maintenance, testing and redundancy to the BOP system criticality was
established by the…
Subjects/Keywords: FMECA; Risk analysis; Subsea BOP; Fuzzy-TOPSIS; PROMETHEE
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APA (6th Edition):
Okonji, S. C. (2015). Multi criteria risk analysis of a subsea BOP system. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/11869
Chicago Manual of Style (16th Edition):
Okonji, Stephen Chiedu. “Multi criteria risk analysis of a subsea BOP system.” 2015. Doctoral Dissertation, Cranfield University. Accessed January 23, 2021.
http://dspace.lib.cranfield.ac.uk/handle/1826/11869.
MLA Handbook (7th Edition):
Okonji, Stephen Chiedu. “Multi criteria risk analysis of a subsea BOP system.” 2015. Web. 23 Jan 2021.
Vancouver:
Okonji SC. Multi criteria risk analysis of a subsea BOP system. [Internet] [Doctoral dissertation]. Cranfield University; 2015. [cited 2021 Jan 23].
Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/11869.
Council of Science Editors:
Okonji SC. Multi criteria risk analysis of a subsea BOP system. [Doctoral Dissertation]. Cranfield University; 2015. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/11869
Cranfield University
17.
Okonji, Stephen Chiedu.
Multi criteria risk analysis of a subsea BOP system.
Degree: PhD, 2015, Cranfield University
URL: http://dspace.lib.cranfield.ac.uk/handle/1826/11869
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716146
► The Subsea blowout preventer (BOP) which is latched to a subsea wellhead is one of several barriers in the well to prevent kicks and blowouts…
(more)
▼ The Subsea blowout preventer (BOP) which is latched to a subsea wellhead is one of several barriers in the well to prevent kicks and blowouts and it is the most important and critical equipment, as it becomes the last line of protection against blowout. The BOP system used in Subsea drilling operations is considered a Safety – Critical System, with a high severity consequence following its failure. Following past offshore blowout incidents such as the most recent Macondo in the Gulf of Mexico, there have been investigations, research, and improvements sought for improved understanding of the BOP system and its operation. This informs the need for a systematic re-evaluation of the Subsea BOP system to understand its associated risk and reliability and identify critical areas/aspects/components. Different risk analysis techniques were surveyed and the Failure modes effect and criticality analysis (FMECA) selected to be used to drive the study in this thesis. This is due to it being a simple proven cost effective process that can add value to the understanding of the behaviours and properties of a system, component, software, function or other. The output of the FMECA can be used to inform or support other key engineering tasks such as redesigning, enhanced qualification and testing activity or maintenance for greater inherent reliability and reduced risk potential. This thesis underscores the application of the FMECA technique to critique associated risk of the Subsea BOP system. System Functional diagrams was developed with boundaries defined, a FMECA were carried out and an initial select list of critical component failure modes identified. The limitations surrounding the confidence of the FMECA failure modes ranking outcome based on Risk priority number (RPN) is presented and potential variations in risk interpretation are discussed. The main contribution in this thesis is an innovative framework utilising Multicriteria decision making (MCDA) analysis techniques with consideration of fuzzy interval data is applied to the Subsea BOP system critical failure modes from the FMECA analysis. It utilised nine criticality assessment criteria deduced from expert consultation to obtain a more reliable ranking of failure modes. The MCDA techniques applied includes the technique for order of Preference for similarity to the Ideal Solution (TOPSIS), Fuzzy TOPSIS, TOPSIS with interval data, and Preference Ranking Organization Method for Enrichment of Evaluations (PROMETHEE). The outcome of the Multi-criteria analysis of the BOP system clearly shows failures of the Wellhead connector, LMRP hydraulic connector and Control system related failure as the Top 3 most critical failure with respect to a well control. The critical failure mode and components outcome from the analysis in this thesis is validated using failure data from industry database and a sensitivity analysis carried out. The importance of maintenance, testing and redundancy to the BOP system criticality was established by the sensitivity analysis. The potential for…
Subjects/Keywords: 622; FMECA; Risk analysis; Subsea BOP; Fuzzy-TOPSIS; PROMETHEE
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APA (6th Edition):
Okonji, S. C. (2015). Multi criteria risk analysis of a subsea BOP system. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/11869 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716146
Chicago Manual of Style (16th Edition):
Okonji, Stephen Chiedu. “Multi criteria risk analysis of a subsea BOP system.” 2015. Doctoral Dissertation, Cranfield University. Accessed January 23, 2021.
http://dspace.lib.cranfield.ac.uk/handle/1826/11869 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716146.
MLA Handbook (7th Edition):
Okonji, Stephen Chiedu. “Multi criteria risk analysis of a subsea BOP system.” 2015. Web. 23 Jan 2021.
Vancouver:
Okonji SC. Multi criteria risk analysis of a subsea BOP system. [Internet] [Doctoral dissertation]. Cranfield University; 2015. [cited 2021 Jan 23].
Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/11869 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716146.
Council of Science Editors:
Okonji SC. Multi criteria risk analysis of a subsea BOP system. [Doctoral Dissertation]. Cranfield University; 2015. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/11869 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716146
University of Dundee
18.
Morrow, Damian.
Pipe-soil interaction on a clay seabed.
Degree: PhD, 2016, University of Dundee
URL: https://discovery.dundee.ac.uk/en/studentTheses/a39e6fbb-c6f0-44cc-9419-4b018db357af
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716204
► Subsea pipelines form an integral part of the infrastructure associated with offshore oil and gas developments. These pipelines fulfill a range of functions from linking…
(more)
▼ Subsea pipelines form an integral part of the infrastructure associated with offshore oil and gas developments. These pipelines fulfill a range of functions from linking extraction wells to other subsea infrastructure to transporting products onshore, or to a central processing facility. Ancillary pipelines may also be present for gas or water injection to the reservoir or transporting additives. Pipelines are typically installed directly onto the seabed and, in the absence of significant drivers to undertake burial operations, they may remain on the seabed for the remainder of their design life. This is typically the case for deepwater developments. Subsea pipelines are subjected to a wide range of load cases including, self weight, installation loads, thermal and pressure driven expansion and hydrodynamic loading. Design of pipeline systems to accommodate these load cases requires an understanding of pipe-soil interaction. This thesis reports the results of a research study investigating pipe-soil interaction on a clay seabed, as relevant to the design of subsea pipeline systems. This study has utilised numerical analysis techniques based on the finite difference code FLAC to investigate a range of problem definitions. These problem definitions include pipelines subject to both vertical loading (V) and combined vertical and horizontal (V-H) loading. Factors such as variation in interface conditions, large strain and large displacement effects, soil unit weight effects and variation in shear strength conditions were considered in these problem definitions. Reliability based analysis techniques have also been used to investigate both V and V-H loading problem definitions. The analyses and investigations undertaken as part of this study generally achieved the following; reproduction and validation of earlier research with additional interpretation, extension of problem definitions to deeper pipeline embedment depths and investigation of pipe-soil interaction problem definitions that have not previously been considered. Reliability based analysis techniques have also provided some interesting insights into the impact of soil shear strength variation as well as providing a fundamental link between safety factors and probability of failure. Application to design practice of this, and similar studies, has been considered as part of this thesis and potential areas for future research have also been suggested.
Subjects/Keywords: 621.8; Pipe-soil interaction; Subsea pipelines; Clay; Numerical analysis
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APA ·
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MLA ·
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APA (6th Edition):
Morrow, D. (2016). Pipe-soil interaction on a clay seabed. (Doctoral Dissertation). University of Dundee. Retrieved from https://discovery.dundee.ac.uk/en/studentTheses/a39e6fbb-c6f0-44cc-9419-4b018db357af ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716204
Chicago Manual of Style (16th Edition):
Morrow, Damian. “Pipe-soil interaction on a clay seabed.” 2016. Doctoral Dissertation, University of Dundee. Accessed January 23, 2021.
https://discovery.dundee.ac.uk/en/studentTheses/a39e6fbb-c6f0-44cc-9419-4b018db357af ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716204.
MLA Handbook (7th Edition):
Morrow, Damian. “Pipe-soil interaction on a clay seabed.” 2016. Web. 23 Jan 2021.
Vancouver:
Morrow D. Pipe-soil interaction on a clay seabed. [Internet] [Doctoral dissertation]. University of Dundee; 2016. [cited 2021 Jan 23].
Available from: https://discovery.dundee.ac.uk/en/studentTheses/a39e6fbb-c6f0-44cc-9419-4b018db357af ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716204.
Council of Science Editors:
Morrow D. Pipe-soil interaction on a clay seabed. [Doctoral Dissertation]. University of Dundee; 2016. Available from: https://discovery.dundee.ac.uk/en/studentTheses/a39e6fbb-c6f0-44cc-9419-4b018db357af ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716204
19.
Venables, Robert.
Thermal behaviour of transient high pressure hydrocarbon systems.
Degree: PhD, 1997, Imperial College London
URL: http://hdl.handle.net/10044/1/8020
Subjects/Keywords: 660; Subsea pipelines; Heat transfer
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APA (6th Edition):
Venables, R. (1997). Thermal behaviour of transient high pressure hydrocarbon systems. (Doctoral Dissertation). Imperial College London. Retrieved from http://hdl.handle.net/10044/1/8020
Chicago Manual of Style (16th Edition):
Venables, Robert. “Thermal behaviour of transient high pressure hydrocarbon systems.” 1997. Doctoral Dissertation, Imperial College London. Accessed January 23, 2021.
http://hdl.handle.net/10044/1/8020.
MLA Handbook (7th Edition):
Venables, Robert. “Thermal behaviour of transient high pressure hydrocarbon systems.” 1997. Web. 23 Jan 2021.
Vancouver:
Venables R. Thermal behaviour of transient high pressure hydrocarbon systems. [Internet] [Doctoral dissertation]. Imperial College London; 1997. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10044/1/8020.
Council of Science Editors:
Venables R. Thermal behaviour of transient high pressure hydrocarbon systems. [Doctoral Dissertation]. Imperial College London; 1997. Available from: http://hdl.handle.net/10044/1/8020
National University of Ireland – Galway
20.
Connaire, Adrian.
A Quasi-Rotation Newton-Raphson method for the analysis of marine risser structures
.
Degree: 2014, National University of Ireland – Galway
URL: http://hdl.handle.net/10379/4776
► This thesis describes a method which represents a novel approach for the prediction of coupled axial, bending and torque response of compliant beam structures undergoing…
(more)
▼ This thesis describes a method which represents a novel approach for the prediction of coupled axial, bending and torque response of compliant beam structures undergoing finite deflections and rotations. The analysis of beams of this type has extensive application in the
subsea industry particularly for the prediction of the extreme response of riser and mooring system components.
The approach presented in this work is based on the convected coordinates method, Euler-Bernoulli beam theory, the principle of virtual work and the FEM. It involves the development of two quasi-rotation measures including a quasi-material rotation definition to describe rotational deformation relative to a convected axis of a beam and a quasi-space rotation definition address the path dependent nature of rotations in three dimensions.
The particularly novel aspect of the work involves the use of a rate-of-rotation measure with respect to the axis of a beam and the means by which this quantity is used to establish linear transformations that describe quasi-material rotations in terms of quasi-space rotations. The transformations developed are shown to be particularly suitable for the development of the tangent stiffness matrix for use in conjunction with the Newton-Raphson method.
Numerical analysis and comparisons with other evaluation methods show that the formulation developed leads to significantly improved robustness and convergence rates compared to existing state-of-the-art methods for beam structures
subject to highly nonlinear three-dimensional complex load paths. The examples also demonstrate the accuracy and efficiency of the method particularly for models with larger and less finite elements compared to alternative solutions.
Advisors/Committee Members: Harte, Dr. Annette (advisor).
Subjects/Keywords: Quasi-Rotation;
Newton-Raphson;
Subsea riser;
Finite rotations;
Finite element method
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APA (6th Edition):
Connaire, A. (2014). A Quasi-Rotation Newton-Raphson method for the analysis of marine risser structures
. (Thesis). National University of Ireland – Galway. Retrieved from http://hdl.handle.net/10379/4776
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Connaire, Adrian. “A Quasi-Rotation Newton-Raphson method for the analysis of marine risser structures
.” 2014. Thesis, National University of Ireland – Galway. Accessed January 23, 2021.
http://hdl.handle.net/10379/4776.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Connaire, Adrian. “A Quasi-Rotation Newton-Raphson method for the analysis of marine risser structures
.” 2014. Web. 23 Jan 2021.
Vancouver:
Connaire A. A Quasi-Rotation Newton-Raphson method for the analysis of marine risser structures
. [Internet] [Thesis]. National University of Ireland – Galway; 2014. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10379/4776.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Connaire A. A Quasi-Rotation Newton-Raphson method for the analysis of marine risser structures
. [Thesis]. National University of Ireland – Galway; 2014. Available from: http://hdl.handle.net/10379/4776
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
21.
van de Riet, B.A.M. (author).
Shallow foundations for subsea structures: a comparison between design codes and numerical analysis.
Degree: 2016, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:bb15bdfd-2e7b-4ba0-961e-811cb73e6c44
► Subsea structures such as pipeline end termination (PLET) structures are currently designed according to the ISO:19901-4 and API RP 2A-WSD design codes by Allseas. It…
(more)
▼ Subsea structures such as pipeline end termination (PLET) structures are currently designed according to the ISO:19901-4 and API RP 2A-WSD design codes by Allseas. It has become interesting to investigate the embedded conservatism in these design codes as not only the increasing demand of installations in larger water depths and/or on poor soil conditions, but also the use of larger pipeline diameters and the increase of the size and weight of
subsea structures. This embedded conservatism could have a significant effect on the economical and operational aspects. The economical aspects can be explained by the costs for fabrication and offshore installation and the operational aspects by the operational limits of current vessels. From a literature review is found that Terzaghi derived an equation for the bearing capacity of the soil for very specific conditions. Afterwards several investigators including Brinch Hansen, Vesic and Meyerhof revised the solution in order to determine the bearing capacity of the soil for more general situations. Brinch Hansen is mostly followed by the ISO design code, while Vesic is followed by the API design code. Two different safety approaches are found from an analytical analysis of the investigated design codes, namely the partial safety factor approach in the ISO design code and the global safety factor approach in the API design code. Both the investigated design codes only determine a safety factor against bearing failure and sliding failure in order to determine the safety of a foundation design. In this study four case studies are investigated and a review of the site investigation reports is performed. Since no sufficient information regarding soil deformation parameters are provided to Allseas only the embedded conservatism in the design codes regarding soil strength is investigated in this study. For all four case studies an increasing shear strength profile is determined. This profile can however not be modeled in the API design code, therefore a constant shear strength profile which gives an equivalent soil bearing capacity as compared to the increasing shear strength profile is determined. Two methods using the numerical program PLAXIS are applied to determine a constant shear strength profile. In this investigation the numerical program PLAXIS is used to determine the embedded conservatism in the ISO and API design cods. Two PLAXIS models are used, in the first model the partial safety factor approach is considered and partial load and material factors are applied to the input values. The results of the PLAXIS model are compared to the results from the ISO design code. In the second PLAXIS model the global safety factor approach is considered and the results are compared to the results from the API design code. The ratio between the safety factors against bearing and sliding failure as determine by PLAXIS and the design codes is used in this study to investigate the embedded conservatism in the design codes. Ratio’s between 1.5 and 2.3 are found for the foundation designs…
Advisors/Committee Members: Hicks, M.A. (mentor), Pisano, F. (mentor), Brinkgreve, R.B.J. (mentor), Burgers, R. (mentor), Yenigul, N.B. (mentor).
Subjects/Keywords: shallow foundation; numerical analysis; subsea structures; plaxis; design codes
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APA (6th Edition):
van de Riet, B. A. M. (. (2016). Shallow foundations for subsea structures: a comparison between design codes and numerical analysis. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:bb15bdfd-2e7b-4ba0-961e-811cb73e6c44
Chicago Manual of Style (16th Edition):
van de Riet, B A M (author). “Shallow foundations for subsea structures: a comparison between design codes and numerical analysis.” 2016. Masters Thesis, Delft University of Technology. Accessed January 23, 2021.
http://resolver.tudelft.nl/uuid:bb15bdfd-2e7b-4ba0-961e-811cb73e6c44.
MLA Handbook (7th Edition):
van de Riet, B A M (author). “Shallow foundations for subsea structures: a comparison between design codes and numerical analysis.” 2016. Web. 23 Jan 2021.
Vancouver:
van de Riet BAM(. Shallow foundations for subsea structures: a comparison between design codes and numerical analysis. [Internet] [Masters thesis]. Delft University of Technology; 2016. [cited 2021 Jan 23].
Available from: http://resolver.tudelft.nl/uuid:bb15bdfd-2e7b-4ba0-961e-811cb73e6c44.
Council of Science Editors:
van de Riet BAM(. Shallow foundations for subsea structures: a comparison between design codes and numerical analysis. [Masters Thesis]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:bb15bdfd-2e7b-4ba0-961e-811cb73e6c44
Delft University of Technology
22.
Hillen, Huub (author).
Technical feasibility assessment for hydrogen transport through existing offshore gas pipelines in the Dutch sector.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:b186b9f3-5a5a-4099-8c48-1982e61be8af
► In the last century, the offshore industry has installed a network of offshore pipelines in the southern North Sea. Due to decreasing oil and gas…
(more)
▼ In the last century, the offshore industry has installed a network of offshore pipelines in the southern North Sea. Due to decreasing oil and gas extraction in the North Sea, many pipelines of this network are becoming redundant. A potential option for the reuse of these pipelines is the transport and storage of gaseous hydrogen, which is increasingly considered as an attractive energy carrier for a fossil fuel free economy. A Shell study has shown that offshore hydrogen production located at a renewable energy source, such as an offshore wind park, can economically compete with onshore hydrogen production that uses power cables to transport the energy to shore. The offshore hydrogen production case is based on newly built pipelines. If it is technically feasible to use existing pipelines, this can contribute to making the offshore hydrogen production case more attractive. A transition from hydrocarbon transport to hydrogen transport through existing carbon steel gas pipelines changes the material behaviour of the pipeline, including a change in fatigue behaviour. Fatigue damage due to Vortex-induced vibrations (VIV) in offshore pipeline parts that are suspended above the seabed is a major challenge for oil and gas transportation in the southern North Sea. Therefore, it is of great importance to understand the change in fatigue behaviour due to the presence of gaseous hydrogen to assess the technical feasibility of hydrogen transport through the existing offshore pipelines. A fatigue analysis for a specified existing gas pipeline of the NAM in the southern North Sea has been done according to DNV Free Spanning Assessment Methodology. For this analysis, the fatigue SN-curve for carbon steel material in a hydrogen environment is required. The SN-curve is approached based on available fatigue data for carbon steel material in hydrogen and severe sour environments. It shows that hydrogen has a significant influence on the fatigue behaviour of carbon steel material. The fatigue analysis outcomes show that adjustments to the pipeline are needed to avoid a significant increase in the risk of fatigue failure in critical pipeline sections. A remediation analysis has shown that rock dumping comes out as the cheapest option. An existing time-domain numerical model that can determine the dynamic behaviour of a pipeline due to VIV is extended to perform fatigue damage calculations. The pipeline is modelled as a Euler-Bernoulli beam using the Finite Element Method. The model determines the VIV with a modal analysis in time-domain, which allows the model to include non-linear soil behaviour. The fatigue damage is determined for each pipeline element, which gives the fatigue damage distribution over the length of the pipeline. The time-domain numerical model is compared with the DNV Free Spanning Assessment Methodology and gives significantly higher fatigue lives. This suggests that the methodology that is used for the fatigue analysis is too conservative. However, there is still uncertainty about the influence of…
Advisors/Committee Members: Metrikine, Andrei (mentor), Jarquin Laguna, Antonio (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: VIV; Vortex-induced vibrations; Hydrogen transport; Pipeline; Subsea; spans; Fatigue
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APA (6th Edition):
Hillen, H. (. (2019). Technical feasibility assessment for hydrogen transport through existing offshore gas pipelines in the Dutch sector. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b186b9f3-5a5a-4099-8c48-1982e61be8af
Chicago Manual of Style (16th Edition):
Hillen, Huub (author). “Technical feasibility assessment for hydrogen transport through existing offshore gas pipelines in the Dutch sector.” 2019. Masters Thesis, Delft University of Technology. Accessed January 23, 2021.
http://resolver.tudelft.nl/uuid:b186b9f3-5a5a-4099-8c48-1982e61be8af.
MLA Handbook (7th Edition):
Hillen, Huub (author). “Technical feasibility assessment for hydrogen transport through existing offshore gas pipelines in the Dutch sector.” 2019. Web. 23 Jan 2021.
Vancouver:
Hillen H(. Technical feasibility assessment for hydrogen transport through existing offshore gas pipelines in the Dutch sector. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Jan 23].
Available from: http://resolver.tudelft.nl/uuid:b186b9f3-5a5a-4099-8c48-1982e61be8af.
Council of Science Editors:
Hillen H(. Technical feasibility assessment for hydrogen transport through existing offshore gas pipelines in the Dutch sector. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:b186b9f3-5a5a-4099-8c48-1982e61be8af
23.
Day, A. H.
An integrated approach to the design of moonpools for subsea operations.
Degree: PhD, 1987, University of Strathclyde
URL: http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=26622
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233833
► The use of moonpools for the launch and retrieval of diving bells and remotely operated vehicles from a mother ship is well established, and the…
(more)
▼ The use of moonpools for the launch and retrieval of diving bells and remotely operated vehicles from a mother ship is well established, and the advantages of the moonpool approach are well known. The use of moonpools in Floating Production Systems is also becoming more common, as a means of allowing the marine riser to enter the vessel. The moonpool offers protection from wind and current forces and reduces the effects of angular motions of the vessel. The only problem with the moonpool concept is that the water column inside a badly designed moonpool may suffer from large and apparently unpredictable vertical surges, making operations through the moonpool hazardous, and in extreme cases threatening the seaworthiness of the vessel. The work described here shows how a moonpool design may be optimised for a particular vessel in order that such problems may be avoided. The dynamics of the problem are established, such that the water column oscillation and the forces on a subsea unit in the moonpool may be predicted. The effects of a variety of geometrical configurations are then studied, both mathematically and experimentally, in order to select configurations which allow large modifications of the moonpool response. A quantitative measure of moonpool performance is proposed, allowing individual designs to be ranked in terms of the long term expected downtime due to the moonpool. Finally, the understanding and results thus gained are integrated in order to produce a practical design procedure for a moonpool of any size, in any vessel, and in any operational area. A worked example based on a real design problem is presented in order to illustrate the practical application of the method.
Subjects/Keywords: 623.8; Subsea vehicle launching
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APA (6th Edition):
Day, A. H. (1987). An integrated approach to the design of moonpools for subsea operations. (Doctoral Dissertation). University of Strathclyde. Retrieved from http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=26622 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233833
Chicago Manual of Style (16th Edition):
Day, A H. “An integrated approach to the design of moonpools for subsea operations.” 1987. Doctoral Dissertation, University of Strathclyde. Accessed January 23, 2021.
http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=26622 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233833.
MLA Handbook (7th Edition):
Day, A H. “An integrated approach to the design of moonpools for subsea operations.” 1987. Web. 23 Jan 2021.
Vancouver:
Day AH. An integrated approach to the design of moonpools for subsea operations. [Internet] [Doctoral dissertation]. University of Strathclyde; 1987. [cited 2021 Jan 23].
Available from: http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=26622 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233833.
Council of Science Editors:
Day AH. An integrated approach to the design of moonpools for subsea operations. [Doctoral Dissertation]. University of Strathclyde; 1987. Available from: http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=26622 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233833
Pontifical Catholic University of Rio de Janeiro
24.
BRUNO FONTES RODRIGUES.
[en] OIL AND GAS SUBSEA PROCESSING ANALYSIS: NEW
PERSPECTIVES WITHOUT THE USE OF PLATAFORMS.
Degree: 2018, Pontifical Catholic University of Rio de Janeiro
URL: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35183
► [pt] O petróleo tem importância inegável nos tempos atuais. Junto com outros combustíveis fósseis, representa uma considerável parcela da matriz energética da sociedade. Porém esta…
(more)
▼ [pt] O petróleo tem importância inegável nos tempos
atuais. Junto com outros combustíveis fósseis, representa uma
considerável parcela da matriz energética da sociedade. Porém esta
é uma fonte de energia não renovável. Por isso a medida que o
petróleo é produzido em regiões de fácil acesso, sua fonte vai se
esgotando e criando a necessidade de se explorar em regiões cada
vez mais inóspitas. Diante deste cenário o processamento submarino
na produção de óleo e gás tem grande relevância ao permitir a
produção de petróleo em regiões onde não seria possível a produção
sem esta opção. O objetivo deste trabalho é comparar 2 sistemas de
processamento submarino, um com bomba multifásica e outro com
separador submarino, visando identificar as oportunidades de
aplicação para cada sistema e o estado da arte atual de cada
tecnologia. O grande salto do processamento submarino será um
futuro de produção sem o uso de plataformas. Cenário este que já se
observa nos dias de hoje em alguns campos de gás. O campo de gás
foi o primeiro a apresentar a possibilidade de produção sem o uso
de plataforma por possuir energia suficiente para escoar por
distâncias maiores sem necessidade de incremento artificial de
pressão. Porém com o avanço da tecnologia da bomba e dos
separadores submarinos, o futuro indica a aplicação deste processo
também em campos de óleo. Este trabalho disponibiliza uma
ferramenta simplificada para análise de escoamento multifásico de
fácil acesso que permite o cálculo sem a necessidade de softwares
avançados e de difícil acesso. Apesar de ser uma ferramenta
simplificada é de grande utilidade para cálculos rápidos sem
necessidade de detalhamento.
[en] Oil has undeniable importance in modern times.
Along with other fossil fuels, represents a considerable portion of
the energy matrix of society. However this is non-renewable energy
source. As the oil is been produced in areas of easy access, its
source is being exhausting and creating the need to explore in
inhospitable regions. Looking to this scenario subsea processing of
oil and gas has great importance to allow oil production in regions
where the production would not be possible without this option. The
objective of this study is to compare two subsea processing
systems, one with a multiphase pump and other with a separator and
a monophase pump, identify opportunities of each system and the
current state of the art of each technology. The leap of subsea
processing will be a future of production systems without the use
of platforms. This scenario already being felt today in some gas
fields. The gas field was the first to present the possibility of
production without the use of the platform due to the fact that gas
fields has enough energy to flow over large distances without the
need of artificial lifting. However, with the advancement in pump
technology and subsea separators, the future indicates the
application of this procedure also in oil fields. This paper
provides a simplified calculation tool for multiphase flow of easy
access that allows the calculation…
Advisors/Committee Members: CARLOS VALOIS MACIEL BRAGA.
Subjects/Keywords: [pt] BOMBA MULTIFASICA; [en] BOOSTING SYSTEM; [pt] SEPARADOR SUBMARINO; [en] SUBSEA SEPARATOR; [pt] PROCESSAMENTO OLEO GAS SUBMARINO; [en] SUBSEA OIL GAS PROCESSES; [pt] POCO A TERRA; [en] WELL THE EARTH
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APA (6th Edition):
RODRIGUES, B. F. (2018). [en] OIL AND GAS SUBSEA PROCESSING ANALYSIS: NEW
PERSPECTIVES WITHOUT THE USE OF PLATAFORMS. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35183
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
RODRIGUES, BRUNO FONTES. “[en] OIL AND GAS SUBSEA PROCESSING ANALYSIS: NEW
PERSPECTIVES WITHOUT THE USE OF PLATAFORMS.” 2018. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed January 23, 2021.
http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35183.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
RODRIGUES, BRUNO FONTES. “[en] OIL AND GAS SUBSEA PROCESSING ANALYSIS: NEW
PERSPECTIVES WITHOUT THE USE OF PLATAFORMS.” 2018. Web. 23 Jan 2021.
Vancouver:
RODRIGUES BF. [en] OIL AND GAS SUBSEA PROCESSING ANALYSIS: NEW
PERSPECTIVES WITHOUT THE USE OF PLATAFORMS. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2018. [cited 2021 Jan 23].
Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35183.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
RODRIGUES BF. [en] OIL AND GAS SUBSEA PROCESSING ANALYSIS: NEW
PERSPECTIVES WITHOUT THE USE OF PLATAFORMS. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2018. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35183
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade do Rio Grande do Sul
25.
Faccio, Mateus.
Avaliação de revestimento anticorrosivo orgânico aplicado em válvulas do tipo esfera para operações subsea.
Degree: 2017, Universidade do Rio Grande do Sul
URL: http://hdl.handle.net/10183/169775
► Motivada pelos inúmeros desafios relacionados à exploração de petróleo na região do pré-sal, onde o ambiente agressivo aliado com a grande profundidade são fatores sempre…
(more)
▼ Motivada pelos inúmeros desafios relacionados à exploração de petróleo na região do pré-sal, onde o ambiente agressivo aliado com a grande profundidade são fatores sempre presentes, a busca por materiais alternativos para aplicações em válvulas ganhou destaque. As válvulas subsea, essenciais para projetos de exploração nestas áreas são consideradas um desafio ainda maior. Dessa maneira, estudos e ensaios de desempenho em revestimentos anticorrosivos orgânicos nesse ambiente tornam-se necessários. O objetivo deste trabalho é avaliar a resistência à corrosão e ao desgaste do revestimento anticorrosivo orgânico ECTFE (Halar®) para a aplicação em válvulas industriais do tipo esfera para operações subsea, através da realização de ensaios em corpos de prova e em protótipos, perante as condições simuladas do ambiente agressivo na qual deverão operar em conformidade com o programa de qualificação do revestimento D-SMA/ING/SPF/TCNA-14-00047. Para a realização dos ensaios, foram projetados sistemas de tubulações fechadas (loopings), nos quais os protótipos foram instalados. Os parâmetros de testes estabelecidos, assim como os dados monitorados pelos sensores instalados, foram coletados durante todo o período de teste. Os ensaios definidos para a avaliação do revestimento orgânico em protótipos foram: ciclos de pressão, circulação sob vazão, circulação com água arenosa e ensaios de corrosão com e sem defeito imposto no revestimento. Complementarmente, corpos de prova em escala reduzida foram submetidos a ensaio de adesão e de fadiga. Os resultados obtidos foram conclusivos e o revestimento mostrou-se resistente às condições impostas aos protótipos, uma vez que não foram detectadas descontinuidades consideradas relevantes segundo os critérios de aceitação pré-estabelecidos em procedimento.
The search for alternative materials for applications in valves has been highlighted motivated by the numerous challenges related to oil and gas in the pre-salt region, where the aggressive environment combined with great depth are always present factors. The subsea valves, essential for exploration projects in these areas, are considered an even bigger challenge, thus, studies and performance tests on organic anti-corrosion coatings in this environment become necessary. The purpose of this study is to evaluate resistance to corrosion and wear of organic anti-corrosion coating ECTFE (Halar®) for application of industrial ball valves for subsea operations, by conducting tests on specimens and prototypes, under simulated harsh environment conditions in which they should operate in accordance with the coating qualification program D-SMA / ING / SPF / TCNA-14-00047. Closed pipes systems are designed (loops) for the carrying out of the tests, in which the prototypes were installed. The set of test parameters as well as the monitored data by installed sensors were collected during the entire test period. The defined tests for the evaluation of the organic coating in prototypes were: pressure cycles, flow rate circulation, circulation in soapy…
Advisors/Committee Members: Rocha, Alexandre da Silva.
Subjects/Keywords: Válvulas (Engenharia); Subsea; Revestimentos anti-corrosivos; Ball valves; Ensaios de materiais; Organic coating; Prototypes
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APA ·
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CSE |
Export
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Manager
APA (6th Edition):
Faccio, M. (2017). Avaliação de revestimento anticorrosivo orgânico aplicado em válvulas do tipo esfera para operações subsea. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/169775
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Faccio, Mateus. “Avaliação de revestimento anticorrosivo orgânico aplicado em válvulas do tipo esfera para operações subsea.” 2017. Thesis, Universidade do Rio Grande do Sul. Accessed January 23, 2021.
http://hdl.handle.net/10183/169775.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Faccio, Mateus. “Avaliação de revestimento anticorrosivo orgânico aplicado em válvulas do tipo esfera para operações subsea.” 2017. Web. 23 Jan 2021.
Vancouver:
Faccio M. Avaliação de revestimento anticorrosivo orgânico aplicado em válvulas do tipo esfera para operações subsea. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2017. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10183/169775.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Faccio M. Avaliação de revestimento anticorrosivo orgânico aplicado em válvulas do tipo esfera para operações subsea. [Thesis]. Universidade do Rio Grande do Sul; 2017. Available from: http://hdl.handle.net/10183/169775
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
26.
Oluwadairo, Tolulope.
An evaluation of subsea pump technologies that can be used to achieve dual gradient drilling.
Degree: MS, Petroleum Engineering, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2571
► Dual Gradient Drilling is an exciting technology which promises to solve the current technical hurdles and economic risks of Deepwater Drilling. Several techniques for Dual…
(more)
▼ Dual Gradient Drilling is an exciting technology which promises to solve the current
technical hurdles and economic risks of Deepwater Drilling. Several techniques for Dual
Gradient Drilling have been proposed to the industry. One such method involves
installing a
subsea booster pump at the seafloor with the aim of returning the drilling
fluid back to the rig. The pump will manage annular pressures in the wellbore as
circulation rates and mud weights vary and will permit early detection of wellbore
influxes. Any such pump chosen to achieve this objective will be subjected to very high
differential pressures and will be faced with the onerous task of lifting very abrasive and
viscous mud slurries from the sea floor back to the drilling rig. This distance in deep
water may be well within the range of about 4, 000 – 12,000 feet depending on the
operating water depth of the rig.
Several pump technologies available to the industry were examined. Piston pumps are
very efficient and can withstand the high differential pressures encountered in the
Mudlift Drilling System. However, their drawbacks are their large size and weight and
high initial capital cost and maintenance costs. Centrifugal pumps on the other hand are relatively smaller than piston and diaphragm pumps and are generally less expensive.
Disc pumps, with their non-impingement design are able to handle solids and fluids with
a high gas volume fraction but, like centrifugal pumps, are generally less efficient than
reciprocating pumps. Diaphragm pumps are capable of maintaining a constant rate
regardless of pressure fluctuations. They can handle very abrasive solids with limited
wear on the pump. They also excel at handling very viscous fluids and they can be
modified to handle up to 95% gas volume fraction. Like piston pumps, they have very
high efficiencies.
The potential of each of these pump technologies to meet the requirements for the
Mudlift Drilling System was examined in this thesis. The benefits and drawbacks of
each of these pump technologies were highlighted and modifications to meet the
demands of the mudlift system evaluated.
Advisors/Committee Members: Hans, Juvkam-Wold C. (advisor), Jerome, Schubert J. (committee member), Kuang-An, Chang (committee member).
Subjects/Keywords: SUBSEA PUMP TECHNOLOGIES; DUAL GRADIENT DRILLING
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APA ·
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Export
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Manager
APA (6th Edition):
Oluwadairo, T. (2009). An evaluation of subsea pump technologies that can be used to achieve dual gradient drilling. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2571
Chicago Manual of Style (16th Edition):
Oluwadairo, Tolulope. “An evaluation of subsea pump technologies that can be used to achieve dual gradient drilling.” 2009. Masters Thesis, Texas A&M University. Accessed January 23, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2571.
MLA Handbook (7th Edition):
Oluwadairo, Tolulope. “An evaluation of subsea pump technologies that can be used to achieve dual gradient drilling.” 2009. Web. 23 Jan 2021.
Vancouver:
Oluwadairo T. An evaluation of subsea pump technologies that can be used to achieve dual gradient drilling. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2571.
Council of Science Editors:
Oluwadairo T. An evaluation of subsea pump technologies that can be used to achieve dual gradient drilling. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2571
Cranfield University
27.
Abili, Nimi.
Subsea fluid sampling to maximise production asset in offshore field development.
Degree: PhD, 2015, Cranfield University
URL: http://dspace.lib.cranfield.ac.uk/handle/1826/10017
► The acquisition of representative subsea fluid sampling from offshore field development asset is crucial for the correct evaluation of oil reserves and for the design…
(more)
▼ The acquisition of representative subsea fluid sampling from offshore field
development asset is crucial for the correct evaluation of oil reserves and for
the design of subsea production facilities. Due to rising operational
expenditures, operators and manufacturers have been working hard to
provide systems to enable cost effective subsea fluid sampling solutions. To
achieve this, any system has to collect sufficient sample volumes to ensure
statistically valid characterisation of the sampled fluids. In executing the
research project, various subsea sampling methods used in the offshore
industry were examined and ranked using multi criteria decision making; a
solution using a remote operated vehicle was selected as the preferred
method, to compliment the subsea multiphase flowmeter capability, used to
provide well diagnostics to measure individual phases – oil, gas, and water.
A mechanistic (compositional fluid tracking) model is employed, using the fluid
properties that are equivalent to the production flow stream being measured,
to predict reliable reservoir fluid characteristics on the subsea production
system. This is applicable even under conditions where significant variations
in the reservoir fluid composition occur in transient production operations. The
model also adds value in the decision to employ subsea processing in
managing water breakthrough as the field matures. This can be achieved
through efficient processing of the fluid with separation and boosting delivered
to the topside facilities or for water re-injection to the reservoir.
The combination of multiphase flowmeter, remote operated vehicle deployed
fluid sampling and the mechanistic model provides a balanced approach to
reservoir performance monitoring. Therefore, regular and systematic field
tailored application of subsea fluid sampling should provide detailed
understanding on formation fluid, a basis for accurate prediction of reservoir
fluid characteristic, to maximize well production in offshore field development.
Subjects/Keywords: MPFM; ROV; Numerical simulation; Enhance oil recovery; transient flow model; Subsea processing; Synergy; OPEX
Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Abili, N. (2015). Subsea fluid sampling to maximise production asset in offshore field development. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/10017
Chicago Manual of Style (16th Edition):
Abili, Nimi. “Subsea fluid sampling to maximise production asset in offshore field development.” 2015. Doctoral Dissertation, Cranfield University. Accessed January 23, 2021.
http://dspace.lib.cranfield.ac.uk/handle/1826/10017.
MLA Handbook (7th Edition):
Abili, Nimi. “Subsea fluid sampling to maximise production asset in offshore field development.” 2015. Web. 23 Jan 2021.
Vancouver:
Abili N. Subsea fluid sampling to maximise production asset in offshore field development. [Internet] [Doctoral dissertation]. Cranfield University; 2015. [cited 2021 Jan 23].
Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/10017.
Council of Science Editors:
Abili N. Subsea fluid sampling to maximise production asset in offshore field development. [Doctoral Dissertation]. Cranfield University; 2015. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/10017
Cranfield University
28.
Abili, Nimi Inko.
Subsea fluid sampling to maximise production asset in offshore field development.
Degree: PhD, 2015, Cranfield University
URL: http://dspace.lib.cranfield.ac.uk/handle/1826/10017
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.687773
► The acquisition of representative subsea fluid sampling from offshore field development asset is crucial for the correct evaluation of oil reserves and for the design…
(more)
▼ The acquisition of representative subsea fluid sampling from offshore field development asset is crucial for the correct evaluation of oil reserves and for the design of subsea production facilities. Due to rising operational expenditures, operators and manufacturers have been working hard to provide systems to enable cost effective subsea fluid sampling solutions. To achieve this, any system has to collect sufficient sample volumes to ensure statistically valid characterisation of the sampled fluids. In executing the research project, various subsea sampling methods used in the offshore industry were examined and ranked using multi criteria decision making; a solution using a remote operated vehicle was selected as the preferred method, to compliment the subsea multiphase flowmeter capability, used to provide well diagnostics to measure individual phases – oil, gas, and water. A mechanistic (compositional fluid tracking) model is employed, using the fluid properties that are equivalent to the production flow stream being measured, to predict reliable reservoir fluid characteristics on the subsea production system. This is applicable even under conditions where significant variations in the reservoir fluid composition occur in transient production operations. The model also adds value in the decision to employ subsea processing in managing water breakthrough as the field matures. This can be achieved through efficient processing of the fluid with separation and boosting delivered to the topside facilities or for water re-injection to the reservoir. The combination of multiphase flowmeter, remote operated vehicle deployed fluid sampling and the mechanistic model provides a balanced approach to reservoir performance monitoring. Therefore, regular and systematic field tailored application of subsea fluid sampling should provide detailed understanding on formation fluid, a basis for accurate prediction of reservoir fluid characteristic, to maximize well production in offshore field development.
Subjects/Keywords: 622; MPFM; ROV; Numerical simulation; Enhance oil recovery; transient flow model; Subsea processing; Synergy; OPEX
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❌
APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Abili, N. I. (2015). Subsea fluid sampling to maximise production asset in offshore field development. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/10017 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.687773
Chicago Manual of Style (16th Edition):
Abili, Nimi Inko. “Subsea fluid sampling to maximise production asset in offshore field development.” 2015. Doctoral Dissertation, Cranfield University. Accessed January 23, 2021.
http://dspace.lib.cranfield.ac.uk/handle/1826/10017 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.687773.
MLA Handbook (7th Edition):
Abili, Nimi Inko. “Subsea fluid sampling to maximise production asset in offshore field development.” 2015. Web. 23 Jan 2021.
Vancouver:
Abili NI. Subsea fluid sampling to maximise production asset in offshore field development. [Internet] [Doctoral dissertation]. Cranfield University; 2015. [cited 2021 Jan 23].
Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/10017 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.687773.
Council of Science Editors:
Abili NI. Subsea fluid sampling to maximise production asset in offshore field development. [Doctoral Dissertation]. Cranfield University; 2015. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/10017 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.687773
Delft University of Technology
29.
Panagiotopoulos, D. (author).
AC Electrical Breakdown Strength of Solid Solid Interfaces: A study about the effect of elasticity, pressure and interface conditions.
Degree: 2015, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:a545393a-98d1-477b-a2d6-1d5f02ee6127
► In several electrical insulation components, such as cable connectors, joints and penetrators, various solid insulating materials are usually brought in contact, forming interfaces. The dielectric…
(more)
▼ In several electrical insulation components, such as cable connectors, joints and penetrators, various solid insulating materials are usually brought in contact, forming interfaces. The dielectric strength of these solid|solid interfaces is critical for the strength of the overall system. Especially in cases that the applied field has a tangential to the interface component, the solid|solid interface is regarded as a point of major weakness. Furthermore, these components are usually used in subsea applications and therefore the presence of water at the interface should be considered. The primary objective of this work is to examine how the elasticity of the solid material, the applied pressure and the interface condition is influencing the 50Hz/AC breakdown strength of the interface with a tangentially applied field. First, an prediction of the effect of varying elasticity modulus on the breakdown strength is attempted through theoretical modelling, adding to existing work. Following, the assumptions are verified by experimental testing in the High Voltage Laboratory of the Norwegian University of Science and Technology (NTNU). In order to facilitate the execution of the tests, a customised setup is built in the laboratory and identical test-samples are produced and prepared. Different pressure levels are applied for each material combination (XLPE|XLPE, SIR|SIR or XLPE|SIR) and for each interface condition (dry, wet or lubricated). The test data are treated using the Weibull distribution and are compared based on the minimum, mean and 63rd percentile value. It is seen that, generally, the minimum or the mean value is adequate to qualitatively compare the strength of different interfaces. Through the tests, it is also seen that the softer the materials that form the interface are, the lower is the elasticity modulus and thus the higher the breakdown strength. The influence of water and insulating oil at the interface is also explored through experimental testing in the lab. Therefore, the breakdown strength of wet and lubricated (oily) interfaces is examined and compared. Through analysing and accordingly presenting the test results, it becomes evident the the wet interface behaves poorly while the lubricated facilitates higher breakdown strength values. Further, the behaviour of an interface comprised by two materials with different elasticity is investigated (hybrid interface). The hybrid interface appeared to be the least affected by water, despite the low applied pressure.
MSc Electrical Engineering - EWEM
Electrical Sustainable Energy
Electrical Engineering, Mathematics and Computer Science
Advisors/Committee Members: Rodrigo Mor, A. (mentor).
Subjects/Keywords: solid interface; XLPE; silicon rubber; SIR; breakdown strength; elasticity modulus; pressure; subsea connectors
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Panagiotopoulos, D. (. (2015). AC Electrical Breakdown Strength of Solid Solid Interfaces: A study about the effect of elasticity, pressure and interface conditions. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:a545393a-98d1-477b-a2d6-1d5f02ee6127
Chicago Manual of Style (16th Edition):
Panagiotopoulos, D (author). “AC Electrical Breakdown Strength of Solid Solid Interfaces: A study about the effect of elasticity, pressure and interface conditions.” 2015. Masters Thesis, Delft University of Technology. Accessed January 23, 2021.
http://resolver.tudelft.nl/uuid:a545393a-98d1-477b-a2d6-1d5f02ee6127.
MLA Handbook (7th Edition):
Panagiotopoulos, D (author). “AC Electrical Breakdown Strength of Solid Solid Interfaces: A study about the effect of elasticity, pressure and interface conditions.” 2015. Web. 23 Jan 2021.
Vancouver:
Panagiotopoulos D(. AC Electrical Breakdown Strength of Solid Solid Interfaces: A study about the effect of elasticity, pressure and interface conditions. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Jan 23].
Available from: http://resolver.tudelft.nl/uuid:a545393a-98d1-477b-a2d6-1d5f02ee6127.
Council of Science Editors:
Panagiotopoulos D(. AC Electrical Breakdown Strength of Solid Solid Interfaces: A study about the effect of elasticity, pressure and interface conditions. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:a545393a-98d1-477b-a2d6-1d5f02ee6127
Delft University of Technology
30.
Sotiriadis, Daan (author).
Motion based cable integrity limits for quadrant assisted pull-in operations on submarine inter-array cables.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:25a5b730-f98c-49f4-92b7-8f99c817e1a3
► The installation of subsea cables connecting offshore wind turbines to the grid is a delicate process. This is especially the case for the operation of…
(more)
▼ The installation of subsea cables connecting offshore wind turbines to the grid is a delicate process. This is especially the case for the operation of connecting the second end of the cable to the turbine. The applied method of using a quadrant means that in the workability analyses, multibody dynamics, line dynamics and sea state dynamics need to be combined, resulting in lengthy simulation requirements. The objective of this thesis is to determine vessel motion based limits to cable integrity in order to simplify workability analyses. This method allows the problem to be analyzed in the frequency domain, resulting in computational efficiency gains. In order to arrive at the desired result a literature study is performed regarding cable loading and cable failure modes encountered during quadrant assisted cable pull-ins. On that basis a detailed investigation into the relations between vessel motion and mechanical cable responses is carried out. To achieve this, a representative cable and a set of high but realistically encountered sea states are simulated. The obtained relations are then compared to the cable integrity limits for curvature, tension and compression to acquire limits expressed in terms of motion parameters such as acceleration, velocity and displacement. The results from these simulations show that: 1) maximum cable tension is closely correlated to upward heave velocity of the crane tip, 2) maximum cable compression is closely correlated to downward heave velocity, 3) maximum curvature is most closely correlated to downward heave velocity. It is concluded from the results that the cable response can be determined from the crane tip heave motion, which in turn is known from the vessel motions. This means that analysis of such a problem is possible in the frequency domain. As the results show that heave motion is governing in cable failure, heave compensation in the crane is recommended for the operations considered. In addition, an enhancement of the analysis process is proposed by extracting the linear relations and vessel motion limits from a small set of time domain simulations and assessing the situation thoroughly in a frequency domain analysis. The configurations considered exclude any effects added by cable protection systems or interaction effects with rigid bodies in the vicinity of the cable. Even though the analysis process is generally applicable and constitutes a significant improvement in computational load, the obtained relations may be generalized further by implementing a closed formula relating vessel motion to cable failure, or application of the cable protection system to the assessed configuration. Additional research in these directions is encouraged.
Offshore and Dredging Engineering
Advisors/Committee Members: Wellens, Peter (mentor), Xu, Pengpeng (graduation committee), Jiang, Xiaoli (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: subsea cables; quadrant; vessel motion based limits; second end pull-in; submarine cables; cable dynamics
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APA ·
Chicago ·
MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sotiriadis, D. (. (2020). Motion based cable integrity limits for quadrant assisted pull-in operations on submarine inter-array cables. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:25a5b730-f98c-49f4-92b7-8f99c817e1a3
Chicago Manual of Style (16th Edition):
Sotiriadis, Daan (author). “Motion based cable integrity limits for quadrant assisted pull-in operations on submarine inter-array cables.” 2020. Masters Thesis, Delft University of Technology. Accessed January 23, 2021.
http://resolver.tudelft.nl/uuid:25a5b730-f98c-49f4-92b7-8f99c817e1a3.
MLA Handbook (7th Edition):
Sotiriadis, Daan (author). “Motion based cable integrity limits for quadrant assisted pull-in operations on submarine inter-array cables.” 2020. Web. 23 Jan 2021.
Vancouver:
Sotiriadis D(. Motion based cable integrity limits for quadrant assisted pull-in operations on submarine inter-array cables. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Jan 23].
Available from: http://resolver.tudelft.nl/uuid:25a5b730-f98c-49f4-92b7-8f99c817e1a3.
Council of Science Editors:
Sotiriadis D(. Motion based cable integrity limits for quadrant assisted pull-in operations on submarine inter-array cables. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:25a5b730-f98c-49f4-92b7-8f99c817e1a3
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