断块油藏开发后期井网再优化研究

Study on re-optimization of well pattern at late development stage of fault-block reservoir

江苏油田进入开发后期,在当前油价下传统的开发注采井网调整模式投入大,适配性差,制约了油田采收率的提高。为探索复杂断块油藏开发中后期经济高效的调整模式,在明确现有井网条件下水驱潜力及剩余油分布状况下,利用数模手段开展拟均质油藏、多层油藏和相控条件下井网优化技术对策研究,形成了一套复杂断块油藏开发后期注采井网再优化技术。分别在江苏油田高7、陈2区块进行了现场实践,实现了区块稳产和提高水驱采收率的目的,对江苏油田高含水后期井网调整挖潜剩余油具有一定的指导意义。

Jiangsu Oilfield has entered the late stage of development.Under the current oil price,the traditional adjustment mode of injection-production well pattern has a large investment and poor adaptability,which restricts the increase of the oilfield recovery efficiency.To explore the economic and efficient adjustment mode in the middle and late stage of complex fault-block reservoir development,based on the understanding of the water drive potential and remaining oil distribution under the existing well pattern conditions,the technical countermeasures of well pattern optimization under the conditions of the homogeneous reservoir,multi-layer reservoir,and phase-control reservoir were studied through numerical simulation,forming a set of re-optimization technology of injection-production well pattern in the late stage of complex fault block reservoir development.The technology has been practiced in G7 and C2 Block in Jiangsu Oilfield,realizing the purpose of stabilizing production and improving water drive recovery,which has a certain guiding significance for well pattern adjustment and tapping potential remaining oil in the later stage of high water-cut in Jiangsu Oilfield.