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You searched for subject:(Pore scale modelling). Showing records 1 – 3 of 3 total matches.

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1. Van den Ende, T.W. Extensional viscosity aspects of HPAM in porous flow: An experimental and numerical study:.

Degree: 2015, Delft University of Technology

Polymer flooding is the most widely used chemical EOR method. Despite being widely used, the apparent shear-thickening behaviour of the polymer solutions in porous flow at high flow rates is poorly understood. One of the supposed mechanisms is the strain-thickening behaviour of polymer solutions. This fluid property will alter the flow dynamics during porous flow compared to Newtonian and purely shear-thinning flow. In this research, the objective is to improve our understanding of polymer flow through a simple single slit geometry (e-VROC) and more complex geometries (porous flow characterised by pore network models) in order to allow oil recovery optimisation for polymer flooding. The intrinsic viscosity of HPAM3630S is investigated experimentally using the Extensional Viscometer/ Rheometer On a Chip (e-VROC). The e-VROC has a microfluidic hyperbolically-shaped contraction-expansion geometry. The water salinity is used as a control parameter to reduce the fluid viscosity. Initial calibration of the device with Newtonian fluids and analytical analysis of the e-VROC geometry indicate that the shear component of the flow is large in the converging section – contrary to the claimed advantages of the hyperbolic geometry. Newtonian flow can therefore not be regarded as extension dominated. Consequently, the provided analysis of the e-VROC pressure data is currently unable to determine the true extensional viscosity of a Newtonian fluid. Therefore the analysis should be regarded as an extensional viscosity indexer in comparing different fluids. For polymer flowthe pressure gradient over the contraction-expansion area increases more than linearlywith increasing flow rate. This indicates strain-thickening behaviour. The salinity highly impacts the amount of strain-thickening; the higher the brine salinity the lower the pressure gradient over the contraction-expansion area. Furthermore, a high noise content in the time-pressure signal is observed together with reproducibility problems regarding polymer flow. Differences upto 30% in pressure gradients between measurements are reported for the same fluid. Both can probably be attributed to elasticity due to the short residence time of the polymer solutions in the contraction-expansion geometry compared to their relaxation times. The fluid flow process is modelled using finite element modelling (GeoDict&COMSOL) and pore network modelling using MATLAB to study the (changed) fluid flow behaviour. It was shown that Newtonian flow through the e-VROC can be modelled using both COMSOL and GeoDict. Furthermore, it was shown that the pressure drop due to pure shear losses in the e-VROC can be significant during polymer flow. The developed Matlab code enables modelling the steady state response of pore network systems. The systems contains more than 10000 non-linear throat equations. This captures both extension-thickening and shear-thinning pressure losses. This successfully demonstrates proof of concept set out at the beginning of this study. Using the pore network model, it is… Advisors/Committee Members: Van Kruijsdijk, C.P.J.W., Welling, M., Romate, J., Bruining, H..

Subjects/Keywords: Extensional viscosity; HPAM; e-VROC; Polymer; Extensional rheology; Pore Networks; Pore Network Modelling; in-situ rheology; Pore scale

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APA (6th Edition):

Van den Ende, T. W. (2015). Extensional viscosity aspects of HPAM in porous flow: An experimental and numerical study:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d932d2b2-9b4a-426e-a759-3aa78fb1c91b

Chicago Manual of Style (16th Edition):

Van den Ende, T W. “Extensional viscosity aspects of HPAM in porous flow: An experimental and numerical study:.” 2015. Masters Thesis, Delft University of Technology. Accessed July 22, 2019. http://resolver.tudelft.nl/uuid:d932d2b2-9b4a-426e-a759-3aa78fb1c91b.

MLA Handbook (7th Edition):

Van den Ende, T W. “Extensional viscosity aspects of HPAM in porous flow: An experimental and numerical study:.” 2015. Web. 22 Jul 2019.

Vancouver:

Van den Ende TW. Extensional viscosity aspects of HPAM in porous flow: An experimental and numerical study:. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2019 Jul 22]. Available from: http://resolver.tudelft.nl/uuid:d932d2b2-9b4a-426e-a759-3aa78fb1c91b.

Council of Science Editors:

Van den Ende TW. Extensional viscosity aspects of HPAM in porous flow: An experimental and numerical study:. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:d932d2b2-9b4a-426e-a759-3aa78fb1c91b


University of New South Wales

2. Liu, Min. Pore-scale Modelling of Reactive Transport.

Degree: Petroleum Engineering, 2017, University of New South Wales

Reactive transport is of great importance in chemical science, hydrogeological and environmental applications. A scalable numerical framework for modelling reactive transport is developed. The migration of solid particles released due to dissolution is included. It is validated by comparing reactive flow simulations with previously published results and dynamic imaging experimental observations. It is used to predict the evolution of pore structure, hydrological and mechanical properties. The impact of pore structure and mineralogical heterogeneity as well as microporosity on reactive transport is also investigated.The impact of pore structure on reactive flow is investigated by simulating reaction on micro-CT images of rocks with different levels of heterogeneity. The results show the more heterogeneous the pore structure is, the faster the permeability increases during dissolution. However, the correlations between pore space heterogeneity and reaction regimes have not yet been quantitatively illustrated. Thus, we quantify the pore geometry with correlation length and conduct reaction simulations in pore-scale correlated porous media. Unstructured irregular pore spaces with different correlation lengths are generated. A conceptual diagram is suggested to relate the reactive transport with the correlation length. Variations of mechanical properties in porous media during reactive flow are studied. Stress load cases on porous media are simulated and maps of deformation in rocks are compared. Dependency of Young’s modulus and Poisson’s ratio on Péclet and Damköhler numbers are demonstrated. The effect of mineralogical heterogeneity is also explored. The mineral map of sandstones was acquired using QEMSCAN SEM-EDS. Pore-scale simulations of multi-mineral reaction were performed directly on rock images. Numerical results show that mineralogical heterogeneity can cause significant errors in permeability predictions. Reactive transport in dual porosity porous media is explored in a fractured medium and carbonates. The Stokes-Brinkman equation is solved for fluid flow in rocks with microporosity. Large discrepancy in dissolution patterns is observed if microporosity is ignored in the reaction simulation. Based on the fluid-solid reaction model by adding the module of fluid-fluid reaction, a fluid-fluid-solid reactive transport model has been developed. Advisors/Committee Members: Mostaghimi, Peyman, Petroleum Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: Porous media; Pore-scale modelling; Reactive transport; Micro-CT imaging

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APA (6th Edition):

Liu, M. (2017). Pore-scale Modelling of Reactive Transport. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/58968 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:48118/SOURCE02?view=true

Chicago Manual of Style (16th Edition):

Liu, Min. “Pore-scale Modelling of Reactive Transport.” 2017. Doctoral Dissertation, University of New South Wales. Accessed July 22, 2019. http://handle.unsw.edu.au/1959.4/58968 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:48118/SOURCE02?view=true.

MLA Handbook (7th Edition):

Liu, Min. “Pore-scale Modelling of Reactive Transport.” 2017. Web. 22 Jul 2019.

Vancouver:

Liu M. Pore-scale Modelling of Reactive Transport. [Internet] [Doctoral dissertation]. University of New South Wales; 2017. [cited 2019 Jul 22]. Available from: http://handle.unsw.edu.au/1959.4/58968 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:48118/SOURCE02?view=true.

Council of Science Editors:

Liu M. Pore-scale Modelling of Reactive Transport. [Doctoral Dissertation]. University of New South Wales; 2017. Available from: http://handle.unsw.edu.au/1959.4/58968 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:48118/SOURCE02?view=true

3. Patel, Ravi Ajitbhai. Lattice Boltzmann method based framework for simulating physico-chemical processes in heterogeneous porous media and its application to cement paste.

Degree: 2016, Ghent University

Subjects/Keywords: Technology and Engineering; microstructure modelling; diffusion in cement paste; reactive transport in multilevel porous media; lattice Boltzmann method; pore scale reactive transport modelling; calcium leaching

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Patel, R. A. (2016). Lattice Boltzmann method based framework for simulating physico-chemical processes in heterogeneous porous media and its application to cement paste. (Thesis). Ghent University. Retrieved from http://hdl.handle.net/1854/LU-8071415

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):

Patel, Ravi Ajitbhai. “Lattice Boltzmann method based framework for simulating physico-chemical processes in heterogeneous porous media and its application to cement paste.” 2016. Thesis, Ghent University. Accessed July 22, 2019. http://hdl.handle.net/1854/LU-8071415.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Patel, Ravi Ajitbhai. “Lattice Boltzmann method based framework for simulating physico-chemical processes in heterogeneous porous media and its application to cement paste.” 2016. Web. 22 Jul 2019.

Vancouver:

Patel RA. Lattice Boltzmann method based framework for simulating physico-chemical processes in heterogeneous porous media and its application to cement paste. [Internet] [Thesis]. Ghent University; 2016. [cited 2019 Jul 22]. Available from: http://hdl.handle.net/1854/LU-8071415.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Patel RA. Lattice Boltzmann method based framework for simulating physico-chemical processes in heterogeneous porous media and its application to cement paste. [Thesis]. Ghent University; 2016. Available from: http://hdl.handle.net/1854/LU-8071415

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.