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Pore-scale modeling of phase change in porous media

Author(s)
Cueto-Felgueroso, Luis; Fu, Xiaojing; Juanes, Ruben
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Abstract
The combination of high-resolution visualization techniques and pore-scale flow modeling is a powerful tool used to understand multiphase flow mechanisms in porous media and their impact on reservoir-scale processes. One of the main open challenges in pore-scale modeling is the direct simulation of flows involving multicomponent mixtures with complex phase behavior. Reservoir fluid mixtures are often described through cubic equations of state, which makes diffuse-interface, or phase-field, theories particularly appealing as a modeling framework. What is still unclear is whether equation-of-state-driven diffuse-interface models can adequately describe processes where surface tension and wetting phenomena play important roles. Here we present a diffuse-interface model of single-component two-phase flow (a van der Waals fluid) in a porous medium under different wetting conditions. We propose a simplified Darcy-Korteweg model that is appropriate to describe flow in a Hele-Shaw cell or a micromodel, with a gap-averaged velocity. We study the ability of the diffuse-interface model to capture capillary pressure and the dynamics of vaporization-condensation fronts and show that the model reproduces pressure fluctuations that emerge from abrupt interface displacements (Haines jumps) and from the breakup of wetting films.
Date issued
2018-08
URI
http://hdl.handle.net/1721.1/117340
Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Journal
Physical Review Fluids
Publisher
American Physical Society
Citation
Cueto-Felgueroso, Luis et al. "Pore-scale modeling of phase change in porous media." Physical Review Fluids 3, 8 (August 2018): 084302 © 2018 American Physical Society
Version: Final published version
ISSN
2469-990X
2469-9918

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