采出液回注方式对驱油效果的影响研究—— 以辽河油田 J 区块为例

辽河油田 J 区块多数油井高含水，储层非均质性强、层间矛盾突出，为了提高 J 区块的原油采收率，实施了二元复合驱。 二元复合驱会产生大量采出液，而采出液中含有化学剂，排放会对环境造成污染，且处理成本较高。 利用室内驱替实验来模拟二元复合驱的采出液，优化采出液的回注方式，研究二元复合驱采出液回注的可行性。 结果表明：聚合物含量较高的采出液可直接作为二元复合驱油体系的前置段塞；采出液原样可直接作为后续保护段塞并后续水驱；采出液的不同回注方式均可提高化学驱采出程度（化学驱采出程度均大于 20% ），采出液的回注不仅可以节约聚合物的用量，同时可以解决采出液的污水处理问题。

Influence of produced liquid reinjection way on oil displacement effect:A case study from J block in Liaohe Oilfield

Because of high water cut for most oil wells, strong reservoir heterogeneity and serious interlayer contradiction,surfactant/polymer compound flooding was carried out to enhance oil recovery in J block, Liaohe Oilfield. However,there are large amounts of produced liquids during surfactant/polymer compound flooding, which is not environmental,and the dealing cost is high. Through simulating produced liquid of surfactant/polymer compound flooding, displacement experiment was proceeded to optimize reinjection method and study its feasibility. The results show that produced liquids with high content of polymer can be used as pre-slug directly and subsequent protection slug. Oil recovery can be enhanced exceed 20% with different reinjection methods. The produced liquid reinjection can not only save the amount of polymer, but also solve the problem of effluent dealing.