Molecular simulation of shale gas adsorption and transport in rough nanopores
Understanding the mechanism of solid-gas interface adsorption and gas injection displacement at the microscopic scale contributes to perfect the theory of shale gas extraction.GCGM(Grant Canonical Monte Carlo)and MD(Molecular Dynamics)methods were consulted to simulate the methane adsorption and diffusion in the pores of rough wall structures.The investigation indicated that the rough structures significantly influence meth-ane adsorption,which is greater in the rough models when the pressure is less than 20 MPa.The breakthrough time of carbon dioxide and methane recovery in the rough models are increased compared to the slit model during gas injection displacement.Due to the larger surface area of the rough shale models,the gas adsorption capacity is stronger at low pressure.The rectangular structures shale model has stronger selective adsorption than the tri-angular and silt models.The research clarifies the microscopic mechanism of methane absorption and displace-ment and provides guidance for improving shale gas recovery.
国家科技期刊平台
NSTL
万方数据
维普
