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The properties of the surface and the interface of the complex system of hexadecyl/octadecyl alcohol polyoxyethylene ether carboxylate with 3 ethoxy groups and octadecyl dimethyl carboxyl betaine were investigated. The complex system had a good synergistic effect and could reduce the Shengli Oilfield crude oil/water interfacial tension (IFT) to 10 −3  mN m −1  in a wide total surfactant concentration with less amount of hexadecyl/octadecyl alcohol polyoxyethylene ether carboxylate. In addition, we explored the effect of the salinity and divalent ion concentration on the interfacial tension (IFT) of the complex system. The results showed that the complex system can be used in the oil field when the salinity is lower than 50 000 mg · L −1  and the molar ratio of octadecyl dimethyl carboxyl betaine/hexadecyl/octadecyl alcohol polyoxyethylene ether carboxylate is 9: 1.

Study of the Complex System of Fatty Alcohol Polyoxyethylene Ether Carboxylate and Alkyl Betaine for Heavy Oil Recovery