二元复合驱表面活性剂界面张力研究

Study on the interfacial tensions of the surfactants used for bi-component combination flooding

研究了二元驱用植物改性羧酸盐表面活性剂SNHD与原油间的动态界面张力,并探讨了聚合物、矿化度、pH值以及时间对界面张力的影响。结果表明SNHD与原油的界面张力能达到超低值;聚合物对界面张力影响不大;矿化度对低活性剂浓度体系界面张力的影响较大,随矿化度增加,界面张力减小;体系的最佳pH值约为7。

This paper discusses the interracial tension between surfactant SNHD included combination system and the crude oil of Daqing oil field. The effect of polymer,salinity, the value of pH and time on interracial tension are studied. The results indicate that ultralow interracial tension （lower than 10-4 mN/m） between modified plant carboxylate surfactant and the crude oil of Daqing oilfield can be reached. The influence of polymer on IFT is not obvious. As low surfactant concentration, salinity influence the interfacial tension more greatly and it will drop as a result of the grow of the salinity;7 is the most proper pH value. This surfactant has a good interfacial activity and may used as a surfactant for combination flooding.