基于层间动用差异的多层砂岩油藏分层配注新方法

Multi-Zone Injecting Optimization for Multi-layer Sandstone Reservoir Based on Producing Differences Between Layers

以油、水两相径向渗流理论为基础,以"以液定注,按需分配,均衡压力"为核心思想,结合储层地质特征及目前水淹、压力分布状况,求取现阶段产液能力,并将其作为纵向劈分因子求取各层产液量。基于地层压力状况及恢复速度要求求取各层注水量,进而对水井进行分层配注。矿场应用表明,新方法更适用于层间动用差异大的多层砂岩油藏,能提高该类油藏高含水期的水驱开发效果。

A new zonal- injection allotting method is proposed according to reservoir characteristics, pressure and flooding distribution, based on the theory of two phase fluid seepage flow. The core idea of this method is ＂liquid production capacity determining the water injection rate, water requirement determining the water distribution and balancing pressure＂ At first, the current liquid -producing capacity is obtained by considering the geological characteristics of reservoir and current flooding and pressure distribution as the longitudinal splitting factor to calcu- late the liquid production of each layer. Then, based on the pressure condition and the recovery speed require- ment, the water injection of each layer is proposed to allot the zonal -injection method. It is proved that the new method is more suitable for multi -layer sandstone reservoirs with great producing differences between layers, and can help improve the effect of water drive development at high water cut stage.