Abstract:In accordance with the characteristics of formation water and dehydrated crude oil from the Chang6 reservoir in Wuliwan,Gemini surfactant A2 can help to achieve ultra-low interfacial tension.In order to explore the structure-activity relationship between Gemini surfactants and the components of crude oil,crude oil components were separated by the method of the oil column chromatographic separation,following,the basic components of crude oil were learned.Then the interfacial tension between Gemini surfactant A2 and the components of crude oil was measured.The results show that,the surfactant shows high interfacial activity in the concentration range 0.5-0.02%,and can help to achieve ultra-low interfacial tension,and confirm that the non hydrocarbon components have important effect on the emergence of ultra low interfacial tension,namly there is synergistic effect between the Gemini surfactant and non hydrocarbon components.