Study on evaluation and reconstruction of reservoir seepage field in high water cut stage based on analysis of seepage characteristics

Abstract

Aiming at the problem of a reservoir in the high water cut stage, and specifically an understanding of the distribution of the residual oil, the existing evaluation methods cannot effectively reflect the flow and distribution of the underground fluid. In this contribution, the seepage field is divided into six sections based on the evaluation of the seepage characteristics of the high water content in the reservoir. The seepage field evolution processes were studied respectively from the different well patterns and the reservoir heterogeneity, and a corresponding seepage field reconstruction method is proposed based on the flow field equilibrium. The results show that the seepage field partition can well reflect the characteristics of the different development stages of reservoir seepage. The seepage field evaluation and reconstruction method is applied to the Nm3-4-1 layer of Gang Dong oilfield, where the water content decreased by 3.8%, and the variation coefficient of the seepage field decreased by 0.33. The evaluation method is of great significance for the exploitation of the remaining oil in high water cut reservoirs.