三元复合驱微观剩余油驱替机理及动用比例研究

摘要

通过天然岩心和微观可视化驱替实验,分析了界面张力对三元复合体系驱油效果的影响规律和作用机理.将微观剩余油进行分类,重点研究了三元复合体系驱动各类剩余油的微观机理.结果表明,界面张力越低,三元复合体系提高采收率的幅度越大,采收率提高值最高可达23.88%.将剩余油分为簇状、柱状、盲端状、油滴状和膜状5种类型,三元复合驱后各类型剩余油的动用比例随界面张力的降低而增大,其中簇状剩余油的动用比例最大,盲端状剩余油的动用比例最小.%The effect of interfacial tension on the displacement efficiency of the ASP system was analyzed by the natural core and microscopic visual displacement experiment.The microscopic residual oil was classified,and the microscopic mechanism of the residual oil driven by the ASP system was studied emphatically.The results show that the lower the interfacial tension is, the higher the recovery rate is,and the recovery rate is up to 23.88%.The remaining oil is divided into 5 types,including cluster type,columnar type,dead-end type,droplets type and oil film type.The proportion of the remaining oil displaced in the ASP flooding increases with the decrease of the interfacial tension.The proportion of cluster residual oil displaced is the largest and the proportion of the dead-end residual oil is the smallest.