In reservoir numerical simulation methods, capillary force is generally considered as a function of water saturation. However, a large number of laboratory experiments show that the capillary force is not only affected by the water saturation, but also influenced by the flow velocity of the fluid. Therefore, the existing numerical simulation methods need to be revised. In this paper, the dynamic capillary force is introduced into the control equation of the oil and water phase, and the basic seepage equations of the reservoir numerical simulation are corrected. Then the IMPES method is used to solve the pressure equation and the saturation equation. A homogeneous model and a heterogeneous model are established, and the influence of dynamic capillary force on the numerical simulation results is analyzed. The results show that under homogeneous conditions, the dynamic capillary force has little effect on the results; under heterogeneous conditions, the dynamic capillary force has greater influence; in low water?鄄cut stage, the water cut calculated with dynamic capillary force increases faster; in high water?鄄cut stage, the water cut with dynamic capillary force increases slower; the sweep coefficient calculated after considering dynamic capillary force is smaller than that calculated without considering dynamic capillary force. The reliability of the method is verified by the actual single well enhanced liquid treatment.
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