海上薄油层引流注水开发实践

Development Practise of Water Dumping in Thin Oil Layers at Sea

东海平湖BJT油田由于受平台条件、水处理能力以及储量规模等条件的限制,无法像陆地油田一样通过注水来实现二次开发。为提高仅依靠弹性驱动进行开采的薄油层H4B的油藏采收率,通过邻井侧钻一分支井眼,将上部水层与该油层连通,利用能量充足的上部水体来补给油藏能量,实现层间引流注水。通过生产观察,油藏压力得到补充,油井产量得以有效稳定,且通过低速开采、周期性开关井的生产制度,使得油水层间压力得以平衡,薄油层的采收率得以提高。该开发实例为同类油藏开发提供了重要的借鉴。

Due to the constraints of platform conditions,water treatment capacity and reserves scale,the secondary development of BJT oilfield in East-China sea can not be achieved by water injection as onshore oil fields.In order to improve the oil recovery of the H4B thin oil layer which is only driven by the elastic drive,the upper aquifer is connected to the oil layer through side-drilling in the adjacent well,and the upper water with sufficient energy is used to replenish the reservoir energy and realize drainage between layers.Due to the water dumping,the reservoir pressure and oil production have been vigorously maintained by production observation.Through the low developing speed and periodic production system,the pressure between the reservoir and the aquifer has been balanced,and the oil recovery of the thin oil layers has been enhanced.It provides an important reference for the development of similar reservoirs.