Novel anionic-nonionic surfactants with alkyl chains of different number of carbon atoms were synthesized,and the interaction between sodium nonylphenol polyoxyethylene ether sulfate(9-EOS),sodium dodecylphenol polyoxyethylene ether sulfate(12-EOS)and high performance surfactant(18-AC)was studied by surface tension technique.The results showed that there was an antagonistic effect between 9-EOS and 18-AC,while there was a synergistic effect between 12-EOS and 18-AC.In addition,the effects of the compound system on the wettability and oil-water interface properties of the mixtures were systematically studied.The compound system effectively reduced the contact angle on the crude oil surface.When the 12-EOS molar fraction is 0-0.6,the 12-EOS/18-AC system has a synergistic effect on the wettability,the contact angle is lower than that of individual surfactants,and the oil-water interface performance is improved.
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