水驱油藏注采受益关系及注水效果定量评价

Quantitative Evaluation of Injection-Production Relation and Water Injection Effect in Water Flooding Reservoir

在压力场基础上采用Pollock方法进行流线追踪,得到渗流场的流线分布;利用隙间速度加权方法将注水井的流量分配给每条流线,得到定量化的流线分布。在此基础上,通过计算注采井之间的流线总流量,得到定量化的注采受益关系及注水井有效注水率;计算注水井每个生产阶段的有效注水率,得到注水井的有效注水率动态曲线。应用实例表明,该方法绝对误差小于5%,对水驱油藏注采受益关系及注水效果定量评价具有现场指导意义。

Based on pressure field,the streamline distribution in seepage field is obtained by tracing the streamlines using Pollock method.The quantitative distribution of the streamlines is achieved by allocating the flow rate of water injection wells to each streamline using interstitial velocity weighting method.On this basis,the quantitative injection-production benefit relationship of well patter and the water injection efficiency of water injection wells are obtained by calculating the total flow rate of the streamlines between injection and production wells.The dynamic curves of the water injection efficiency of water injection wells can be obtained by calculating the water injection efficiency of water injection wells in each production stage.Application cases show that the absolute error of this method is less than 5%.The method has important field guidance significance for quantitative evaluation of injection-production benefit relationship and water flooding effect of water flooding reservoirs.