Micro-scale simulation of brine injection into a porous media saturated with oil was performed using COMSOL Multiphysics. The rock and fluid properties are exported from a carbonate reservoir to investigate water-based enhanced oil recovery (EOR) in the rock-fluid system. The impact of interfacial tension, permeability alteration, capillary entry pressure, and velocity and density of injection brine on the fluids flow pattern in micromodel pore network is investigated. It was observed from the results that in the oil-wet porous system with light crude oil, velocity and wettability alteration are the most important displacement mechanisms and IFT reduction and capillary entry pressure are the second important factors in the enhanced oil recovery process.
