金湖凹陷高含水油藏开发特征与稳产对策

Development characteristics and countermeasures for stabilizing production of high water-cut reservoirs in Jinhu Sag

金湖凹陷于"七五"期间投入开发,目前部分开发单元已进入高含水期,油水分布状况更加复杂,注水利用率降低,高渗带水淹严重,局部井网不完善,水驱波及状况变差,迫切需要采取合理的开发调整方法,为油田后期的剩余油挖潜提供依据。高含水期油田开发的主要目的是控制含水、提高波及系数、改善水驱效果。针对高含水油藏开发中存在的问题,通过对不同类型高含水油藏的开发特征进行研究,分析影响油藏稳产的主要因素,提出了井网加密、改向水驱、细分开发层系、套管侧钻及调剖堵水等综合性技术措施与对策,改善了油田开发效果。

The reservoirs of Jinhu Sag were developed in 1980s. Today some of the development units have gone into high water - cut stage so that the oil - water distribution became more complex. Many contradictions have emerged such as lower utilization factor of water injection, non - uniform response of oil well, serious water flooding of high permeability zone, regional incomplete well patterns and poor waterflood sweep efficiency. Therefore, adopting reasonable development adjusting method is urgently requested in order to provide a reference for remaining oil exploitation at the later period. The main purpose of the high water - cut oilfield development is to control water production, increase sweep efficiency, and im- prove water flooding effect. Aiming at the problems existed in the high water - cut reservoir development, based on the de- velopment characteristics of different types of reservoirs, this paper analyses the influencing factors of oilfield stable produc- tion and proposes measures of infilling well pattern, changing water flooding, dividing the layer series of development, cas- ing side tracking,profile control and water shutoff,which can improve the development efficiency effectively.