稠油底水油藏生产压差值对采收率的影响

Effect of Drawdown Pressure on Recovery Ratio in Heavy Oil Reservoir with Bottom Water

研究生产压差对稠油底水油藏采收率的影响。结果表明:波及系数随着生产压差的增大而增大,最终趋于稳定;驱油效率随着生产压差的增大而减小,最终趋于稳定;采收率随着生产压差增大开始有小幅上升,但是增加到一定程度后,采收率开始小幅下降;生产压差对生产时间影响较大,生产时间随生产压差的增大以指数方式下降;稠油底水油藏采收率和生产时间,生产压差与其之间存在最大合理生产压差;针对海上油田开发高风险、高投入的特点,适当放大生产压差高速开采稠油底水油藏的开发方式是可行的。

This paper researches the effect of drawdoen pressure on recovery ratio in heavy oil reservoir.The results of the study show that the volumetric sweep efficiency increases with the increase of drawdown pressure,and finally tends to be stable.The displacement efficiency reduces with the increase of drawdown pressure,and also finally tends to be stable.The ultimate recovery ratio begins to rise slightly with the increase of drawdown pressure,but to a certain degree,the recovery begins to fall slightly.The production time reduces in index way with the increase of drawdown pressure.There is a reasonable drawdown pressure for the recovery ratio and production time.For the characteristics of the high risk and high investment in offshore oil field,the reasonable high drawdown pressure in heavy oil reservoir with bottom water is practicable.