鄯善油田中含水期合理注采比研究与应用

针对鄯善油田开发初期确定的注采比已不能适应油田中含水期地层压力和产液(油)量逐年下降的开发状况。以物质平衡和注采平衡原理为基础,从理论和实践两方面入手,运用多种方法并重点考虑了地层压力下降造成原油脱气及无效注水量的影响,确定了油田中含水期开发的合理注采比为1.2,根据研究结论并考虑恢复地层压力的需要,现场及时将注采比提高到1.25以上,并取得了较好的应用效果。

The study and application of proper injection-production ratio in medium water cut period in Shanshan Oilfield

Injection-production ratio was determined in initial development stage can't be adapted in medium water cut period,in which formation pressure and liquids production were decreased year by year.Based on material balance and injection and production voidage balance and several methods (emphatically considered the effect of formation pressure decline on crude degasification and invalid rate of water injection),proper injection-production ratio in medium water cut period was determined which was 1.2.According to the study conclusion and the need to build up formation pressure,injection-production ratio was adjusted to more than 1.25 and better application effect was obtained.The study methods in this paper could be used for reference in similar oilfield.