Pore-scale simulation of gas displacement after water flooding using three-phase lattice Boltzmann method

Water flooding is a commonly used technique to improve oil recovery, although the amount of left in reservoirs after procedure still significant. Gas displacement water an effective way recover residual oil, but occurrence state and flow principles multiphase fluid gas injection are ambiguous. Therefore, process should be studied on pore scale provide basis for formulating reasonable program. Most current pore-scale studies focus two-phase flow, while simulations that account influence oil-gas miscibility injected seldom reported. In this work, multi-component multi-phase Shan-Chen lattice Boltzmann model simulate porous medium, effects water, viscosity ratio, structure, analyzed. It established will cause path variations lead premature channeling. Under impact capillary pressure, retained medium during stage further imbibes into tiny pores displaces remaining oil. When considered, interface disappears, eliminating effect enabling recovery at corner. This study sheds light mechanisms from perspective provides potential avenue improving recovery. Cited as: Wang, S., Chen, L., Feng, Q., Fang, C., Cui, R. Pore-scale simulation using three-phase method. Capillarity, 2023, 6(2): 19-30. https://doi.org/10.46690/capi.2023.02.01