胜利油田分层注水工艺技术研究与实践

Research and practice of separated layer water injection technology in Shengli Oilfield

胜利油田经过50多年开发,水驱油藏已进入特高含水期,综合含水率为92.6%,采出程度为26.2%,特高含水、高采出程度条件下提高开发质量对注水技术提出了更高的要求。提高注水"三率"是改善水驱开发质量的关键。针对胜利油田水驱油藏提高注水"三率"的制约因素及前期分层注水工艺技术应用和效果分析,结合胜利油田不同油藏、不同井状和不同工况等注水开发特征对分层注水提出的需求,开展了提高分注率、层段合格率的关键技术研究,实现不同油藏、不同井况标准化管柱的集成化配套。对现场优选"三率"具有提升潜力的水驱开发区块进行规模化推广应用,在工程上提高了整装油藏、断块油藏、低渗透油藏的"三率"指标,在油藏上进一步提升了注采对应率,降低了自然递减率,改善了水驱开发效果。

After more than 50 years of development in Shengli Oilfield,waterflooding reservoirs have entered extra-high water cut period with 92.6%of composite water cut and 26.2%of recovery degree of reserves.The extra-high water cut and higher recovery degree require better water injection technology.The key of improving the quality of waterflood development is to improve the“triple rate”of the water injection.According to the constraints of“triple rate”and the analysis of the effects of separated layer water injection technology at early stage in the water flooding reservoirs of Shengli Oilfield,combined with the requirements of the waterflood development characteristics of different reservoirs,wells and working conditions,key technologies of improving the separated layer injection rate and the pass rate of the strata were researched to achieve the integrated support of standardized strings for different well conditions in different reservoirs.It was applied to the optimized water flooding blocks that have potential of improving“triple rate”with scale popularization.The“triple rate”indicator for the integrated oil reservoir,fault block reservoir and low-permeability reservoir was improved from the aspect of engineering,and the injection-production corresponding rate was further improved in the reservoir.The natural decline rate reduced and the waterflood development effect was improved.