Pore-Scale Simulations of CO2/Oil Flow Behavior in Heterogeneous Porous Media under Various Conditions

Miscible and near-miscible flooding are used to improve the performance of carbon-dioxide-enhanced oil recovery in heterogeneous porous media. However, knowledge effects pore structure on CO2/oil flow behavior under these two conditions is insufficient. In this study, we construct pore-scale models for various methods comparatively analyze efficiency The simulation results indicate that compared immiscible flooding, can increase CO2 sweep area some extent, but it still inefficient displace small throats. For miscible although preferentially displaces through big throats, may subsequently invade order substantially efficiency, priority choice; however, diffusivity has little effect enhancement. injection velocity needs be optimized. High speed up process while maintaining equivalent low beneficial further enhancing conditions.