内酯型槐糖脂生物表面活性剂性能评价

为寻找可应用于三次采油的新型生物表面活性剂,以内酯型槐糖脂生物表面活性剂为驱油剂,系统评价了其临界胶束浓度、表面活性、界面活性、乳化性能及耐温耐盐能力,并通过室内物理模拟驱油实验研究了其驱油效率.结果表明:内酯型槐糖脂生物表面活性剂的临界胶束浓度为100 mg/L,具有良好的表面和界面活性及乳化性能,其乳化性能比石油磺酸盐稳定；具有较强的耐温耐盐能力,适用于高温高盐的油藏环境；内酯型槐糖脂表面活性剂的有效驱油质量浓度为10 mg/L,随着其质量浓度的增加,驱油效率成倍增加,当其质量浓度达到10 000 mg/L时,可提高采收率7.15％,具有良好的驱油性能.通过实验还发现石英砂对内酯型槐糖脂表面活性剂的吸附量较少,说明其是比较经济的生物表面活性剂.

Study on performance about a kind of lactone sophorolipids biosurfactant

In order to explore the new type of biosurfactants which can be applied to the EOR, one kind of lactone sophorolipid biosur?factant was chosen as an oil displacing agent for evaluating the drive oil properties through studying its physical simulation experiment and physical and chemical properties, such as critical micella concentration value (CMC), stability to salinity and temperature, the emulsification value, the effect of core adsorption and physical simulation experiment. The results of physical and chemical properties experiments indicated that the biosurfactant had the good properties in emulsification and reduction of the interfacial tension and surface tension in the complex environment of oil reservoir, such as the high temperature and high salinity reservoir environment. The CMC of the biosurfactant is 100 mg/L, and this kind of biosurfactant could make surface tension of distilled water reduced to 37.1 mN/m and the interfacial tension reduced to 3.07 mN/m. The effective concentration of flooding is 10 mg/L; with the increase of the mass concentration of the surfactant, the oil displacement efficiency increases in double; And, the biosurfactant oil displacement efficiency can reach 7.85% when the concentration of biosurfactant is 10 000 mg/L , which shows good oil displacement performance; By doing experiments, we also found that the quartz sand adsorbed little lactone sophorolipid, which indicates that the lactone sophorolipid biosurfactant is a kind of economic biosurfactant. In Summary, the lactone sophorolipid biosurfactant has great prospects in the field of oil production.