期刊名称：International Journal of Energy and Environment
印刷版ISSN：2076-2895
电子版ISSN：2076-2909
出版年度：2017
卷号：8
期号：3
页码：209-218
出版社：International Energy and Environment Foundation (IEEF)
摘要：In order to understand the complex interaction between gas-water two-phase seepage and stress field with gas adsorption, a mathematical model of gas-water fluid-solid coupling for rock-coal porous media was established based on the stress equation, mass conservation equation, Darcy's law and gas adsorption mass equation. Using the COMSOL software with self-defined function codes, the simulation of seepage in rock-coal porous media with random-generated pore structures was carried out. The results indicate that the pressure of closed pores is larger than that of connected pores in saturated rock-coal porous media, and gas is difficult to get through the reservoir. As the pressure of pores increases, the volumetric strain increases, while the weighting of the adsorption strain decreases, appearing a weak influence on the matrix deformation in rock-coal. Under the present simulation conditions, the difference of magnitude between the volumetric strain and the adsorption strain is about 103, where the adsorption strain has a less influence on permeability, and permeability increases as volume strain increases, which conforms to exponent law
