窄屋脊油藏控水稳油新方法

A NEW METHOD FOR WATER CONTROL AND STABLE OIL PRODUCTION IN NARROW RIDGE RESERVOIR

随着东辛东油田窄屋脊油藏进入开发后期,部分采油井长期一套层系开发,层间干扰严重,同时平面注采井网不完善,造成断块采收率低,逐渐出现了含水上升的问题。通过精细油藏描述与剩余油分布规律研究,表明断块剩余油潜力较大。针对窄屋脊油藏开发管理难点,通过实施层系细分、完善注采井网的综合调整,抓住井组注采主要矛盾,运用配产配注流线调整模式调整地下水线,弱化强势水线,强化弱势水线,使地下水线按照油藏管理者的设想流动,对剩余油进行"围追堵截",实现最大程度驱油,改善水驱效果。优化分注技术提高层系内注采对应率,扩大水驱动用程度,并采取人工仿强边水驱的做法来提高采收率,有效控制含水上升,为油藏长期稳产打下了坚实的基础。

As the narrow ridge reservoir of Dongxin Oilfield enters later stage of development,some producers only were developed in one formation that resulted in serious layer interferences. At the same time the incomplete flooding network caused low recovery rate and increasing water cut. In order to control the increasing water cut,a detailed reservoir description and remaining oil distribution study was conducted,which shows a great potential of remaining oil in the fault. For the difficulties on development of narrow ridge reservoir,we carry out a comprehensive adjustment of layer subdivision and flooding network.Based on the unbalanced injection and production,we adjust the flooding through production and injection allocation to weaken the strong flooding and enhance the weak flooding. The remaining oil can be drived as much as possible and the flooding is improved if the flooding flowed as reservoir engineer expected.The optimized separate layer flooding technology can increase the match rate of injection and production in layers and expand the degree of flooding produced reserves. The method of imitated artificial edge water flooding can increase recovery rate and control water cut effectively,which lay a solid foundation of long term stable production.