A hybrid-dimensional compositional two-phase flow model in fractured porous media with phase transitions and Fickian diffusion

JOURNAL OF COMPUTATIONAL PHYSICS

卷:441

Article

Aghili, Joubine¹  de Dreuzy, Jean-Raynald²  Masson, Roland³  Trenty, Laurent⁴ 

[1] Univ Strasbourg, CNRS, AIRMA UMR 7501, F-67000 Strasbourg, France

[2] Univ Rennes, CNRS, Geosci Rennes, Rennes, France

[3] Univ Cote dAzur, CNRS, INRIA, LJAD, Nice, France

[4] Andra, Chatenay Malabry, France

关键词: Discrete Fracture Models;    Two-phase Darcy flow;    Fickian diffusion;    Phase transitions;    Finite volume scheme;    Two-point flux approximation;   

DOI  :  10.1016/j.jcp.2021.110452

来源: Elsevier

【 摘 要 】

This paper presents an extension of Discrete Fracture Matrix (DFM) models to compositional two-phase Darcy flow accounting for phase transitions and Fickian diffusion. The hybrid-dimensional model is based on nonlinear transmission conditions at matrix fracture (mf) interfaces designed to be consistent with the physical processes. They account in particular for the saturation jump induced by the different rock types, for the Fickian diffusion in the fracture width, as well as for the thermodynamical equilibrium formulated by complementary constraints. The model is validated by numerical comparison with a reference equi-dimensional model using a TPFA approximation in space and a fully implicit Euler time integration. It is also compared with the usual approach based on an harmonic averaging of the transmissivities at mf interfaces combined with a two-point upwinding of the mobilities jumping over the mf interfaces. Our approach is shown to provide basically the same accuracy than the equi-dimensional model as opposed to the classical harmonic averaging approach which is shown to exhibit physical inconsistency. It is then applied to simulate the desaturation by suction at the interface between a fractured Callovo-Oxfordian argilite storage rock and a ventilation tunnel with data set provided by Andra. (c) 2021 Elsevier Inc. All rights reserved.

【 授权许可】

Free