延长油田YZZ油区长6油藏调整治理研究

Adjustment and Management of Chang 6 Reservoir in YZZ Oil Block of Yanchang Oilfield

针对延长油田YZZ油区存在的平面产液结构不均衡,纵向上水驱动用程度低等问题,首先在平面上通过细分注水单元、差异化注水,均衡补充地层能量;然后在剖面上对不吸水或压高注不进的注水井实施措施增注,有效提高水驱动用程度;再对地层能量得到恢复的区域,进行油井重复压裂,提高单井产能。矿场应用结果表明:运用该方法可改善注水开发效果,降低自然递减率,达到了稳产增产的目标,为低渗透长6油藏注水开发提供宝贵经验。

To solve the problems existed in YZZ oil block of Yanchang Oilfield,such as the unbalanced plane liquid production structure and the low degree of water driving in the vertical direction,this paper explores measures of curbing continuous production decline.First,the formation energy is balanced and supplemented by subdividing water injection units and differential water injection on the plane;Next,on the profile,the injection wells which can’t absorb water or can’t be injected into water are implemented with measures to increase injection to effectively improve the degree of water driving;finally,in the area where the formation energy is recovered,the oil well is refractured to improve single well production.The field application results show that this method can improve water injection development effect,reduce natural decline rate,and achieve the goal of stable production,which provides valuable experiences for water injection development in low-permeability Chang 6 Reservoir.