利用数值模拟技术研究扶余油田周期注水模式

Insights into Cyclic Waterflooding Mode with Numerical Simulation in Fuyu Oilfield

针对扶余油田目前高含水开发、油藏非均质性较强、注入水形成严重的无效水循环的现状,开展了基于岩心尺度的数值模拟研究,研究了注水方式、注入速度、原油黏度、注水时机、含油饱和度场等参数对周期注水效果的影响。结果表明,油藏非均质性、地层压力等是实施周期注水的前提;周期注水的最终采收率随原油黏度和转注含水率的增加而降低;周期注水最终采收率增量随原油黏度的增加而增加,随转注含水率的增加而降低;周期注水的含油饱和度场要优于连续注水。所以对于非均质性较强的油藏,应在早期进行周期注水,可有效提高油田采收率。研究成果为扶余油田下步科学制订注水调整及周期方案提供了理论基础。

Currently,Fuyu Oilfield features in high water-cut development,strong reservoir heterogeneity,and severe inefficient water circulation caused by injected water.For this,the research on injection model with numerical simulation that based on the core dimension has been conducted,probed into the influence of such parameters as waterflooding way,injection rate,crude oil viscosity,waterflooding time,and oil saturation field on cyclic waterflooding effect.Results showed that reservoir heterogeneity,formation pressure,etc.are premises of cyclic waterflooding;the ultimate recovery of cyclic waterflooding dropped with the increase of crude oil viscosity and conversion water content;the increment of ultimate recovery of cyclic waterflooding rose with the increase of crude oil viscosity and declined with the increase of conversion water content;the oil saturation field of cyclic waterflooding was superior to that of continued waterflooding.Therefore,with regard to the reservoir of stronger heterogeneity,we had to carry on cyclic waterflooding in the early period,which could enhance recovery in the oilfield efficiently.The research laid theoretical basis for scientifically drawing up waterflooding regulation and cyclic plans in Fuyu Oilfield in near future.