聚驱后剩余油潜力的分布特征研究及挖潜措施

针对聚驱后剩余油少且高度分散,油层中残留聚合物的存在使流度控制更加困难、聚驱后没有可行的提高采收率方法、开采难度大的实际情况,为了进一步提高采收率,系统地开展了聚驱后剩余油分布特征及剩余储量潜力研究。明确了聚驱后剩余储量潜力及挖潜方向,聚驱后油层含水饱和度的上升及残留聚合物的存在使流度控制更加困难,必须在调堵的基础上扩大波及体积,在扩大波及体积基础上提高驱油效率,优化确定了合理的井网。本文利用二类上返井的水淹层解释资料,给出了聚驱后的剩余油潜力的分布特征,对今后油田改善聚驱后开发效果和进一步挖潜地下剩余资源具有重要的指导意义。

Investigation on the Distribution Rule Of Potential Of Remaining Oil And The Way of Working Out The Potentialities after Polymer Flooding

It is difficult for further developing after polymer flooding due to the scattered oil and residual polymer and there are no practical EOR methods.In order to further enhance oil recovery,we carry out some systematic studies which are respectively residual oil distribution characteristics and potential remaining reserves,its influences on EOR methods,EOR methods evaluation,starting injection time and well pattern optimization and so on.Based on above studies,we know where the remaining reserves are and the direction of further tapping.It is difficult to control mobility due to the increasing water saturation and the existence of residual polymer,so it is required that swept volume increased must be on the basis of profile adjustment and water plugging and enhanced displacement efficiency must be on the basis of swept volume increased.The studies have important instructions for improving the effect of exploitation after polymer flooding and further developing for the remaining reserves.