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1.
Jin, Xiao.
Experimental Investigation for the Effects of the Core Geometry on the Optimum Acid Flux in Carbonate Acidizing.
Degree: 2013, Texas Digital Library
URL: http://hdl.handle.net/1969; 
http://hdl.handle.net/2249.1/66516
► Previous matrix acidizing experimental research showed that there exists an optimum acid interstitial velocity (Vi-opt) that results in the minimum volume of acid used while…
(more)
▼ Previous matrix acidizing experimental research showed that there exists an optimum acid interstitial velocity (Vi-opt) that results in the minimum volume of acid used while providing the best stimulation results. There are already several upscaling models that translate experimental results into field conditions. By finding the optimum core geometry to use for matrix acidizing experiments, a great amount of time and money will be saved in selecting the correct size core for future experimental work. Laboratory experiments have already indicated that the optimum acid interstitial velocity can be independent of the core length when the core length is long enough.
In this thesis, further core flood experiments were done using four inches diameter cores that varied in length. The lengths of the cores are 4 inches, 6 inches, and 8 inches long. The acid concentration used for these experiments was 15 wt% HCl. A pressure drop plot was created as the acid penetrates through the core sample. By looking at the pressure drop plot, the start of acid penetration, the early stages of wormhole competition, the later stages of a dominant wormhole forming, and the time when the acid breaks through the core can all be recorded.
Theoretical works were done to correlate experimental results with previously published work. It can be concluded that when the core reaches a certain length, the optimum interstitial velocity becomes independent of the core length due to the dominant wormhole being formed. Also, when the core length reaches a certain value, the optimum acid injection rate is independent of the core radius given that the core radius is large enough to comprise the early effects of wormhole competition. One inch diameter cores should never be used because it only shows the dominant wormhole being formed.
Advisors/Committee Members: Zhu, Ding (advisor).
Subjects/Keywords: Core Geometry; Optimum Acid Flux
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APA (6th Edition):
Jin, X. (2013). Experimental Investigation for the Effects of the Core Geometry on the Optimum Acid Flux in Carbonate Acidizing. (Thesis). Texas Digital Library. Retrieved from http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66516
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):
Jin, Xiao. “Experimental Investigation for the Effects of the Core Geometry on the Optimum Acid Flux in Carbonate Acidizing.” 2013. Thesis, Texas Digital Library. Accessed April 11, 2021.
http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66516.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jin, Xiao. “Experimental Investigation for the Effects of the Core Geometry on the Optimum Acid Flux in Carbonate Acidizing.” 2013. Web. 11 Apr 2021.
Vancouver:
Jin X. Experimental Investigation for the Effects of the Core Geometry on the Optimum Acid Flux in Carbonate Acidizing. [Internet] [Thesis]. Texas Digital Library; 2013. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66516.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jin X. Experimental Investigation for the Effects of the Core Geometry on the Optimum Acid Flux in Carbonate Acidizing. [Thesis]. Texas Digital Library; 2013. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66516
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
2.
Underwood, Jarrod.
Acid Fracture and Fracture Conductivity Study of Field Rock Samples.
Degree: 2013, Texas Digital Library
URL: http://hdl.handle.net/1969;
http://hdl.handle.net/2249.1/66584
► Acid fracturing is a well stimulation strategy designed to increase the productivity of a producing well. The parameters of acid fracturing and the effects of…
(more)
▼ Acid fracturing is a well stimulation strategy designed to increase the productivity of a producing well. The parameters of acid fracturing and the effects of acid interaction on specific rock samples can be studied experimentally. Acid injection data and fracture conductivity measurements obtained in the research presented in this thesis yielded results that qualified and quantified the impact of a specific acid system on rock samples of varying acid solubility.
Six rock samples from a carbonate reservoir were labeled A through F to protect proprietary information included in this research. A 2% potassium chloride solution was used for the acid system and fracture conductivity measurements to prevent clay swelling. Injection temperature, contact time, and injection rate were designed to simulate field treatment conditions. The effects of a chelating agent on fracture conductivity were also studied.
Before and after images of the rock samples indicated that the effect of 15% hydrochloric acid on the samples was limited but correlated with the rock acid solubility. Samples E and F had a greater value of acid solubility and showed noticeable surface etching. Samples A, B, and C had lower values of acid solubility and did not show signs of surface etching. Sample D was of moderate acid solubility and showed minimal signs of surface etching. Fracture conductivity did not correlate directly with acid solubility, but likely was a function of inherent matrix permeability based on leak-off measurements and fracture conductivity measurements. Finally, the fracture conductivity of Sample D increased after exposure to a chelating agent.
Commonly, acid fracture experimental studies are carried out with outcrop rock samples. The samples have more homogenous properties and without hydrocarbon content. In this study, cores from downhole formation were used. The original condition was preserved as much as possible to simulate real field situations. However, using field rock samples does present challenges not generally associated with outcrop rock samples.
Based on the information gathered from the work presented in this thesis, conclusions were drawn concerning the effectiveness of a 15% hydrochloric acid treatment in this formation and the challenges of using field rock samples.
Advisors/Committee Members: Zhu, Ding (advisor).
Subjects/Keywords: Acid Fracture
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APA ·
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CSE |
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APA (6th Edition):
Underwood, J. (2013). Acid Fracture and Fracture Conductivity Study of Field Rock Samples. (Thesis). Texas Digital Library. Retrieved from http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66584
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):
Underwood, Jarrod. “Acid Fracture and Fracture Conductivity Study of Field Rock Samples.” 2013. Thesis, Texas Digital Library. Accessed April 11, 2021.
http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66584.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Underwood, Jarrod. “Acid Fracture and Fracture Conductivity Study of Field Rock Samples.” 2013. Web. 11 Apr 2021.
Vancouver:
Underwood J. Acid Fracture and Fracture Conductivity Study of Field Rock Samples. [Internet] [Thesis]. Texas Digital Library; 2013. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66584.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Underwood J. Acid Fracture and Fracture Conductivity Study of Field Rock Samples. [Thesis]. Texas Digital Library; 2013. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66584
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
3.
Ouyang, Liangchen.
Theoretical and Numerical Simulation of Non-Newtonian Fluid Flow in Propped Fractures.
Degree: 2013, Texas Digital Library
URL: http://hdl.handle.net/1969;
http://hdl.handle.net/2249.1/66624
► The flow of non-Newtonian fluids in porous media is important in many applications, such as polymer processing, heavy oil flow, and gel cleanup in propped…
(more)
▼ The flow of non-Newtonian fluids in porous media is important in many applications, such as polymer processing, heavy oil flow, and gel cleanup in propped fractures. Residual polymer gel in propped fractures results in low fracture conductivity and short effective fracture length, sometimes causing severe productivity impairment of a hydraulically fractured well. Some residual gels are concentrated in the filter cakes built on the fracture walls and have much higher polymer concentration than the original gel. The residual gel exhibits a higher yield stress, and is difficult to remove after fracture closure. But non-Newtonian fluid has complicated rheological equation and its flow behavior in porous media is difficult to be described and modeled. The Kozeny-Carman equation, a traditional permeability-porosity relationship, has been popularly used in porous media flow models. However, this relationship is not suitable for non-Newtonian fluid flow in porous media.
At first, I studied polymer gel behavior in hydraulic fracturing theoretically and experimentally. I developed a model to describe the flow behavior of residual polymer gel being displaced by gas in parallel plates. I developed analytical models for gas-liquid two-phase stratified flow of Newtonian gas and non-Newtonian residual gel to investigate gel cleanup under different conditions. The concentrated gel in the filter cake was modeled as a Herschel-Buckley fluid, a shear-thinning fluid following a power law relationship, but also having a yield stress.
Secondly, I used a combination of analytical calculations and 3D finite volume simulation to investigate the flow behavior of Herschel-Bulkley non-Newtonian fluid flow through propped fractures. I developed the comprehensive mathematical model, and then modified the model based on numerical simulation results. In the simulations, I developed a micro pore-scale model to mimic the real porous structure of flow channel in propped fractures. The correlation of pressure gradient and superficial velocity was investigated under the influence of primary parameters, such as yield stress, power law index, and consistency index. I also considered the effect of proppant packing arrangement and proppant diameter. The Herschel-Bulkley model was used with an appropriate modification proposed by Papanastasiou to avoid the discontinuity of the apparent viscosity and numerical difficulties.
Advisors/Committee Members: Zhu, Ding (advisor).
Subjects/Keywords: non-Newtonian fluid
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ouyang, L. (2013). Theoretical and Numerical Simulation of Non-Newtonian Fluid Flow in Propped Fractures. (Thesis). Texas Digital Library. Retrieved from http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66624
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):
Ouyang, Liangchen. “Theoretical and Numerical Simulation of Non-Newtonian Fluid Flow in Propped Fractures.” 2013. Thesis, Texas Digital Library. Accessed April 11, 2021.
http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66624.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ouyang, Liangchen. “Theoretical and Numerical Simulation of Non-Newtonian Fluid Flow in Propped Fractures.” 2013. Web. 11 Apr 2021.
Vancouver:
Ouyang L. Theoretical and Numerical Simulation of Non-Newtonian Fluid Flow in Propped Fractures. [Internet] [Thesis]. Texas Digital Library; 2013. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66624.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ouyang L. Theoretical and Numerical Simulation of Non-Newtonian Fluid Flow in Propped Fractures. [Thesis]. Texas Digital Library; 2013. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66624
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
4.
Liao, Lulu.
Interpretation of Array Production Logging Measurements in Horizontal Wells for Flow Profile.
Degree: 2013, Texas Digital Library
URL: http://hdl.handle.net/1969;
http://hdl.handle.net/2249.1/66855
► Interpretation of production logging in multi-phase flow wells is challenging, especially for highly deviated wells or horizontal wells. Flow regime-dependent flow conditions strongly affect the…
(more)
▼ Interpretation of production logging in multi-phase flow wells is challenging, especially for highly deviated wells or horizontal wells. Flow regime-dependent flow conditions strongly affect the measurements of production logging tools. Segregation and possible back flow of denser phases result in misinterpretation of the inflow distribution. To assess the downhole flow conditions more accurately, logging tools have been developed to overcome the flow regime related issues. Multiple-sensor array tools measure the fluid properties at multiple locations around the cross-sectional area of the wellbore, providing a distributed measurement array that helps to relate the measurements to flow regime and translate the measurement to inflow distribution. This thesis present a methodology for using array data from production logging tools to interpret downhole flow conditions. The study uses an example logging tool that consists of 12 resistivity, 12 capacitance probes, and six spinners around the wellbore circumference. The method allows interpretation of phase volumetric flow rates in sub-divided cross-sectional areas based on sensor locations. The sub-divided area method divides the wellbore cross-sectional area into several layers depending on the number and arrangement of the sensors with each layer containing at least one sensor. Holdup and velocity outputs from sensors in each wellbore area segment are combined to calculate the volumetric flow rates of each phase in each segment. These results yield a profile of flow of each phase from the high side to the low side of the wellbore, and the overall flow rates of each phase at every location along the well where the interpretation method is applied.
The results from different methods of interpreting production logging are compared in the thesis. Three Eagle Ford horizontal well examples are presented in the thesis; one has single sensor PLT measures, and the other two cases used a multiple sensor tool package. The examples illustrate differences of interpretation results by different methods, and recommend the procedures that yield better interpretation of multiple sensor array tools.
Advisors/Committee Members: Zhu, Ding (advisor).
Subjects/Keywords: Multi Array Tools
Record Details
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Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Liao, L. (2013). Interpretation of Array Production Logging Measurements in Horizontal Wells for Flow Profile. (Thesis). Texas Digital Library. Retrieved from http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66855
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):
Liao, Lulu. “Interpretation of Array Production Logging Measurements in Horizontal Wells for Flow Profile.” 2013. Thesis, Texas Digital Library. Accessed April 11, 2021.
http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66855.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Liao, Lulu. “Interpretation of Array Production Logging Measurements in Horizontal Wells for Flow Profile.” 2013. Web. 11 Apr 2021.
Vancouver:
Liao L. Interpretation of Array Production Logging Measurements in Horizontal Wells for Flow Profile. [Internet] [Thesis]. Texas Digital Library; 2013. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66855.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Liao L. Interpretation of Array Production Logging Measurements in Horizontal Wells for Flow Profile. [Thesis]. Texas Digital Library; 2013. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66855
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
. 
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