Finite Element Simulation of Oil-water Two-phase Flow in Fractured Rocks

Using Galerkin finite element method to simulate oil-water two-phase flow in fracture-matrix dual media at the core scale. The effects of compression coefficient, heterogeneity and water injection mode on the two-phase seepage are analyzed, and the influence law of fractures on water-flooding is derived by considering the morphology and distribution of fractures. The results show that fractures parallel to the main flow direction will reducing the oil displacement effect; When the fractures are located inside the dual medium, most of the oil remains in the pores of the fractures and its surrounding matrix; fractures perpendicular to the main seepage direction can improve the rate of matrix utilization. Reservoirs with low compression coefficient and weak heterogeneity are more suitable for water injection; pulse water injection can effectively improve oil displacement efficiency, and the higher the frequency, the more significant the effect is.