油田开发井组产层分层动用新方法研究

The New Method for Separating Layer Production in Oilfield Development Well Group

摘要: 针对开发井组监测资料不足、分层动态分析难度大等多层系合采油田，提出以井组内注采平衡为依据，利用岩心驱替实验所得PV倍数与含水率关系曲线、无因次指数进行井组产层动用情况的研究方法。该方法视井组为一个统一整体，充分考虑了注水井与受效油井的影响因素(包括油层厚度、渗透率、原油黏度、地应力方向、注采井距、生产压差、改造措施等)，通过平面和垂向系数合理劈分注水井分层注水量，计算油井各小层分层产量。运用该方法计算了X油田近300口水井分层吸水量和油井分层产夜量，与现场实测剖面结果相符，表明该方法可靠。

Abstract: For multiplayer commingled producing oilfields with insufficient monitoring information, difficult dynamic analysis on separating layers, so based on injection and production balance of the well group, this paper proposed a method using the relationship curves of PV multiplier and water cut from the laboratory experiment and dimensionless index to analyze the reservoir producing condition. By taking the well group as a unified entirety, and the factors affecting injection wells and response wells (reservoir thickness, permeability, viscosity, in site stress direction, injection-production space, producing pressure drop, and stimulation measures) into account, the method calculates oil production of each separate layer by reasonably allocating the injected water of each layer based on the horizontal and vertical coefficient. The water absorbing volume and oil well liquid production by layer separation of 300 wells in X Oilfield calculated by this method are consistent with actual measurement results, it is proven that the method is reliable.