Three-Dimensional Numerical Model for Double-Porosity Media with Two Miscible Fluids Including Geomechanical Response

摘要

The finite-element formulation of a coupled fluid flow and geomechanics for two-phase fluid flow through fractured porous media are presented. Two porosities, pores and fractures, and five phases are introduced. The two fluids are taken as wetting and nonwetting. The governing equations are derived based on the theory of poroelasticity, the effective stress principle, and the balance equations of mass and momentum, taking into account the solubility of nonwetting fluid into wetting fluid. Spatial and temporal discretization of the governing equations has been realized through the Galerkin method and the finite-difference technique, respectively. A three-dimensional numerical code has been developed and validated based on previously published data. Various applications of the model have been demonstrated through three field-scale examples. (C) 2015 American Society of Civil Engineers.