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Pore-scale modeling of phase change in porous media

Luis Cueto-Felgueroso1,*, Xiaojing Fu2, and Ruben Juanes2

  • 1Universidad Politécnica de Madrid, Calle del Profesor Aranguren 3, 28040 Madrid, Spain
  • 2Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

  • *luis.cueto@upm.es
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Phys. Rev. Fluids 3, 084302 – Published 8 August, 2018

DOI: https://doi.org/10.1103/PhysRevFluids.3.084302

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.

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Phys. Rev. Fluids 3, 084302– Published 8 August, 2018
  • Received 12 July 2017
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