特高含水油田剩余油分布与挖潜技术研究

Remaining oil distribution and its potential tapping technique in ultra-high water cut oilfield

针对特高含水开发后期存在的非均质性加强、油田水淹严重、增产效果变差、产量递减大、开发效益差等一系列问题,运用精细储层刻画,结合钻井、生产动态、产吸剖面等资料,对油层的水淹特征和规律、剩余油分布规律进行研究。得到特高含水期应根据井组动态分析和剩余油储量丰度,采用周期注水,辅以注水井调剖和采油井堵水结合、补孔、转层等常规手段作为剩余油挖潜的技术政策,将该研究成果应用于KN油田特高含水期剩余油挖潜,结果表明运用该成果能有效提高油田储层剖面动用程度,挖掘平面、层间剩余油,研究内容对特高含水开发阶段提高油田采收率具有指导意义。

For a series of problems existing in the late stage of ultra-high water cut development,such as enhanced heterogeneity,serious water flooding,poor stimulation effect,large production decline and poor development benefit,the fine reservoir description with drilling,production performance,production profile and other data is used to study the characteristics and laws of water flooding and the distribution of remaining oil.According to the dynamic analysis of well group and the abundance of remaining oil reserves,periodic water injection with profile control of water injection well and water plugging of oil production well,hole filling and layer transfer should be taken as the technical policy for tapping the potential of remaining oil in extra high water cut stage of KN oilfield.The results show that the application of this result can effectively improve the production degree of reservoir profile of the oil field and excavate the remaining oil in plane and interlayer.The research content has guiding significance for improving oil recovery in ultra-high water cut development stage.