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生物表面活性剂是微生物的代谢产物，具有化学方法难以生成的化学基团，性能良好，生产成本低，环境污染小。鼠李糖脂是生物表面活性剂的一种。等效烷烃扫描研究表明，对于高石蜡基特征的大庆脱气脱水原油，鼠李糖脂发酵液界面活性虽然较高，但单独使用时难以形成超低油水界面张力的驱油体系。根据ＨＬＢ值的可加合性和分子结构匹配性原理，将鼠李糖脂发酵液与ＯＰ类非离子表面活性剂复配，筛选出具有较低油水界面张力的驱油体系：０．６％（ｗｔ）发酵液＋０．４％（ｖ）ＯＰ５＋１．０％（ｗｔ）ＮａＯＨ，该体系４５℃恒温下与大庆脱气原油的界面张力小于５×１０－２ｍＮ／ｍ。模拟驱油实验表明，在水驱原油效率５８．６５％的基础上可再提高驱油效率１５．７５％（ＯＯＩＰ）。
Biosurfactant is a metabolite of microorganisms, with chemical groups difficult to generate chemical groups, good performance, low production costs, environmental pollution. Rhamnolipid is a biosurfactant. Equivalent paraffin scans showed that the interfacial activity of the rhamnolipid fermentation broth was high for the Daqing deaerated and dehydrated crude oil with high paraffin content, but it was difficult to form the oil displacement system with ultra-low oil-water interfacial tension when used alone. According to the adaptability of HLB value and the matching principle of molecular structure, rhamnolipid fermentation broth and OP nonionic surfactant were compounded to screen the oil displacement system with lower interfacial tension of oil and water: 0.6% (Wt) fermentation broth + 0.4% (v) OP5 + 1.0% (wt) NaOH. The interfacial tension of this system with Daqing degassed crude oil at a constant temperature of 45 ℃ is less than 5 × 10-2mN / m. The simulated flooding experiment shows that the oil displacement efficiency of 15.75% (OOIP) can be increased based on the water-driven crude oil efficiency of 58.65%.