多注入轮次提高等流度二元驱采收率的实验研究

Experimental Study on Increasing Injecting Times to Enhance Oil Recovery of Equi-mobility Binary System Flooding

针对J16块试验区实施二元驱时,存在注入液在不同渗透性地层中推进速度不均匀、驱油效果变差等问题,开展了多注入轮次提高等流度二元驱采收率的室内实验研究。结果表明:在二元体系的成分和用量相同的条件下,不同注入轮次等流度二元驱采收率不同。实验条件下,四轮次注入时化学驱采出程度最高,达到35.2%,高出一轮次7.49%。多轮次注入二元体系较单轮次注入能够更好的控制含水上升速度,长时间维持较高注入压力,更大限度增强等流度驱油效果。

When J16 test block applied binary compound flooding, there was the phenomenon that the injected liquid＇s propelling rate in the different permeability stratum was asymmetrical and oil displacement efficiency became worse. In order to solve this problem, the experimental study on increasing injecting times to enhance oil recovery of equi-mobility binary system flooding was carried out. The results show that different injection times of equi-mobility binary compound flooding have different recovery under the same condition. Under laboratory conditions, four injection times get the highest chemical flooding recovery of 35.2%, 7.49% larger than one round injection. Compared with single injection, multiple injections can better control water cut increasing rate, maintain high injection pressure for longer time and enhance equi-mobility binary compound flooding effect as far as possible.