聚驱滞留聚合物对无碱二元复合体系影响研究

通过物理模拟试验研究了聚驱后聚合物滞留量随推进距离的变化规律,对比分析了有无聚驱在无碱二元复合体系中聚合物和表面活性剂滞留量随推进距离的变化规律。结果表明,聚驱聚合物滞留量随推进距离增加近似呈指数关系递减,同时注入端区域滞留大量聚合物。近注入端剩余油饱和度较低,复合体系损失少;注入端附近聚合物滞留量较高,有效减缓复合体系的滞留损失,滞留聚合物能保护复合体系,有助于复合体系进入剩余油饱和度较高的地层深部,提高聚驱后复合驱采收率。

Research on Effect of Polymer Flooding Polymer Retention on Alkali Free Binary Composite System

The law of polymer retention level versus advance distance was studied in a physical simulation experiment, and the retention level of polymer and surfactant in an alkali free binary composite system with polymer flooding and that in an alkali free binary composite system without polymer flooding versus the advance distance were compared. The results have shown that polymer retention level decreases exponentially approximately as the advance distance increases, and a large amount of polymer is retained at injection end when polymer flooding is used. The saturation degree of remaining oil in the area near the injection end is relatively small with less composite system. The retention level of polymer is relatively high at injection end, thus reducing the loss of composite system due to retention effectively. The retained polymer can protect the composite system and help the composite system enter into deep portion of formation where the saturation degree of remaining oil is relatively high, thus increasing the recovery efficiency of combination flooding agent after polymer flooding is used.