摘要
针对胜坨油田含油层系多、储层非均质严重的特点,分析了注水开发后期影响原油采收率的因素,结合胜坨油田胜二区沙二74-81单元的应用实例详细阐述了改善单元水驱开发效果的可行性措施。试验措施包括倒替注水、水井调剖、调整产液注水结构以及补孔重分层等。应用表明,措施实施后单元的存水率和水驱指数明显好转,单元的综合含水由96.97%下降到96.36%,动液面由912m回升到836m,单元的自然递减率也得到了有效控制。
According to the character of shengtu oilfield that the oil--bearing series is many and the formation is seriously anisotropic; the factors which affect the oil recovery of the later stage of water injection are analyzed. The feasibility treatment which can improve the effect of unit waterflood is illustrated with the real example of 7-8th unit Sand 2 block, shengtu oilfield. The experimental treatments include rotation waterflooding, water injection well profile control and so on. The experiment demonstrates the water drive index and the drain ratio is improved after the treatments are implemented; the total water percentage of unit drops from 96.97% to 96.36%; the dynamic liquid level up increase from 912 to 835 m, the natural depletion rate is well controlled.
出处
《内蒙古石油化工》
CAS
2008年第12期126-129,共4页
Inner Mongolia Petrochemical Industry
关键词
采收率
注采系统
沉积微相
水驱
Recovery factor
Injection--production system
Sedimentary microfacies
Water drive
