过渡带地区提高注水利用率的调整方法

Adjustment for promoting water injection efficiency in transitional area

针对大庆油田东部过渡带地区存在注采比居高不下、平面压力分布不均衡、吸水差井数较多、注水井方案符合率低、层间矛盾越来越突出、主力油层注水无效循环严重、差油层不吸水比例高、能量补充跟不上、油井增产措施效果差等问题,研究了在注水井上采取细分调整、周期注水、酸化、调剖、注表面活性剂等调整方法,同时在油井上实施补孔、压裂等综合治理措施,提高了注水利用率。实践证明,应用这一系列提高注水利用率的调整方法,能够改善过渡带地区注水开发效果。

The eastern transitional area of Daqing Oilfield is confronted with problems like high production-injection rate, non-uniform plane pressure distribution, large amount of wells with poor water absorption ability, low coincidence rate of injection well plan, worsening bedding surface conflicts, invalid injected water circulation in major reservoirs, high proportion of poor layers without water absorptivity and poor stimulation efficiency caused by insufficient energy supply. Judging from the above problems, studies focusing on injection well adjustments such as subdivision, cyclic water-flooding, acid, profile and surface active agent injection etc. have been conducted, meanwhile, comprehensive treatments like re-perforation and fracturing have been carried out to production wells, through which, the performability of water injection has been enhanced. Practical utilization proves that waterflooding effect could be promoted by the above series of adjustment treatments.