油、水井分层动用状况研究新方法

A new approach to study layered producing performance of oil and water wells

针对注水开发的多层砂岩油田油、水井分层监测资料少、油藏分层动态分析难度大等问题,提出了一种实用的油水井分层动用状况研究新方法:以井组内注采平衡为依据,综合考虑注水井和受其影响的采油井的油层条件(油层厚度,渗透率,原油黏度)和开发条件(注采井距,生产压差,改造措施)等因素,通过平面分配系数和垂向劈分系数,合理劈分注水井的分层注水量,从而得到油井各小层的分层产液量。该方法把油、水井作为一个统一的整体,采取动静结合方式,克服了过去简单地根据油层的产能系数(有效渗透率与有效厚度的乘积)劈分油、水井的分层注水量和产液量的缺陷。大庆葡北油田37口井的现场实际资料验证,用该方法计算的水井分层吸水量和油井的分层产液量与实测吸水量和实测产液量符合率较高。

It is difficult to accurately analyze the performance of a multi-layered sandstone reservoir because zonal testing data of producers and injectors are not adequate. A new practical approach to study the layered producing performance of oil/ water wells is presented to solve the problem. Based on the balanced flood within well groups, the approach taking into account pay zone parameters (such as thickness, permeability and viscosity ) of the injectors and their corresponding producers, and the producing conditions including the producer-injector spacing, producing pressure drop and well stimulations, and distributing the water injection rate to each layer with areal and vertical distribution coefficient, then the layered fluid production rate is calculated. The result obtained by this approach match well with the actual data.