Abstract: The ability of compound systerm driving residual oil after water flooding, with its relative mechnisms, was analyzed by conducting ASP flooding and alkali-free SP flooding in micro-model experiment. The result shows that, compared with water, high viscoelasticity and low IFT make both ASP and SP compound systerm reduce the amount of residual oil with various type significantly, such as the blind end one, the cluster one and the columnar one by draging the oil droplets into oil thread, peeling oil film, emulsifying oil, etc; fixing water flooding recovery about 50%, the ultra recovery of ASP and SP systerm could reach 81.2% and 85.1% respectively, both higher than water about 30 percent; with the same viscosity, the improved-recovery by alkali-free systerm is higher than the ASP systerm, so non-alkali compound flooding is with great application prospect.

Key words: Compound flooding, Microscopic model, Residual oil in dead end pore, Emulsifying oil droplet, ASP/alkali-free compound system

摘要： 采用微观模拟技术，对三元/二元体系启动水驱后残余油进行研究。结果表明，复合体系的高黏弹性及低界面张力特性能够以将油珠拉成油丝、剥离油膜、乳化并携带油滴等方式，大幅度降低水驱后的盲端、簇状、柱状残余油，增加乳化油滴数量，提高驱油效率；当模型水驱采收率为50%时，碱-活性剂-聚合物（ASP）体系最终采收率可达81.2%，SP体系可达85.1%，采收率增幅分别为31.2%和35.1%；等黏度的无碱体系比三元体系驱油效率更高，无碱复合驱具有良好的应用前景。

关键词: 复合驱 , 微观模型 , 盲端残余油 , 乳化油滴 , 三元／无碱复合体系