低渗透裂缝性油藏水驱油渗吸窜流指数研究

Water Flooding Imbibition Transfer Index in Low Permeability Fractured Reservoirs

针对求解裂缝性油藏基质-裂缝渗吸量时需提供每个基质网格块的形状因子而带来的应用难题,引入窜流指数概念,用以描述单位渗吸压差下基质-裂缝渗吸量,通过对产量构成的细分建立了窜流指数与产量、压力的关系式。根据某区块的实际生产测试资料,应用离散裂缝网络模型粗化等效成果,建立基质-裂缝渗吸量与渗吸压差关系曲线,求取了窜流指数。分析油藏合理压力系统,应用窜流指数预测油藏采收率,结果表明:应用窜流指数可以方便的估算基质-裂缝渗吸量,为油藏开发效果动态评价提供理论支持。

In order to avoid requiring shape factor of each grid block for solving matrix-fracture imbibitionamount in fractured reservoir, this paper introduces the concept of transfer index. The transfer index equals the ma-trix-fracture imbibition amount in unit pressure. By analyzing the composition of oil production, this paper buildsthe relationship between transfer index and production and pressure. According to the actual test data of a certainblock, draw the relationship curve between imbibition amount and pressure and gain the transfer index. Applyingthe scale up results of discrete fracture network model, we build reservoir numerical simulation model and predictthe development effect. The result shows that it is feasible to estimate the imbibition amount by transfer index.