双子表面活性剂与原油间动态界面张力研究

通过进行油水动态界面张力测试,系统地研究表面活性剂种类、表面活性剂浓度、水介质矿化度、聚合物及非离子表面活性剂对动态界面张力的影响。结果表明,与传统表面活性剂比12-4-12有较强界面活性,在低浓度下,能将界面张力降低到5×10-3 mN/m。提高表面活性剂浓度,可以缩短达到平衡的时间,但当浓度超过一定值时,继续增加12-4-12浓度,会降低其界面活性。12-4-12最佳浓度为500 mg/L。12-4-12在不同矿化度都表现出良好界面活性,尤其在高矿化度下(25×104 mg/L)最佳。在高矿化度水介质中与常规非离子表面活性剂ANT复配,界面张力可降低到4×10-3 mN/m并稳定在10-3数量级,而与HPAM的复配性能较差,这可能与水介质矿化度过高有关。

Study on Dynamic Interfacial Tension between Gemini Surfactant and Crude Oil

Test is the oil-water dynamic interfacial tension and systematically studied are effects of surfactant types,surfactant concentration,water medium salinity,polymer and nonionic surfactant on dynamic interfacial tension.Study results show that 12-4-12 has better interfacial activity than traditional surfactant and its interfacial tension can be lowered down to 5×10-3 mN/m in low concentration condition.Increasing surfactant concentration can shorten the time to reach balance.However,interfacial activity of 12-4-12 will lower if its concentration reaches a certain value and is increased continuously.The optimum concentration of 12-4-12 is 500 mg/L.12-4-12 has a good interfacial activity in different salinity content and its interfacial activity is optimum especially in high salinity(25×104 mg/L).In high water medium salinity condition,interfacial tension of 12-4-12 can be lowered down to 4×10-3 mN/m and stable at the order of magnitude of 10-3 mN/m if it is combined with traditional nonionic surfactant ANT,while performance of combination with HPAM is poor,which may be have something to do with high salinity of water medium.