低分功能型聚合物相渗曲线特征研究及现场应用

Study on Relative Permeability Curve of Low Molecular Weiglit Function Polymer and its Application

采用低分功能型、增黏性能更好地低分功能型聚合物是聚合物驱提高原油采收率的重要攻关方向之一。通过大量的岩心实验,测定了低分功能型聚合物驱在各种不同条件下的相渗曲线,并与普通聚合物驱进行了对比。结果表明,低分功能型聚合物驱与普通聚合物驱的相渗曲线具有相似的变化规律,随聚合物溶液浓度、岩心渗透率的增加,残余油饱和度明显减少;但等渗点下含水饱和度有所增大(向右移动),油水两相跨度增大。由于低分功能型聚合物在分子链上引入了功能性单体,在低渗透岩心上的驱油效果要好于普通聚合物,并不是聚合物的分子量越大驱油效果越好,还与聚合物的分子构型相关。

Salt resisting polymer with better performance is one of the important research directions in polymer flooding. Relative permeability curves of ＂salt resisting＂ polymer flooding was determined through unsteady method under different concentration and varied permeability in many core experiments, and compared them with ordinary polymer flooding. The results show the relative permeability curve variation of salt-resisting polymer flooding and ordinary polymer flooding are similar, residual oil saturation decreases significantly with the increasing of polymer solution concentration and core permeability. However, water saturation increase （move rightly） at equal-permeability point and the oil-water span became large. In low permeability cores, the oil displacement effect of ＂salt resisting＂ polymer with functional monomer on its molecular chains is better than ordinary polymer. The oil displacement effect is related with molecular configuration rather than molecular mass.