关键词: 阴?非离子表面活性剂, 　稠油, 　界面张力, 　粒径, 　稳定性

Abstract: In order to explore the effect of different types of anionic⁃nonionic surfactants on the emulsification effect of heavy oil and obtain a reliable structure⁃activity relationship. In this paper, six monomeric anionic⁃nonionic surfactants C14E3C, C14E5C, C14E7C, C14E9C, C16E3C, C18E3C and two Gemini anionic⁃ nonionic surfactants OP4, OP15 were selected for a heavy oil block in Shengli Oilfield. By using a spinning drop interfacial tensiometer, stability analyzer, we investigated the effects of surfactant mass fraction, oil⁃water mass ratio, and polymer addition on oil⁃water interfacial tension, particle size and stability of crude oil emulsion. The results show that: the type of monomer has little effect on the stability of the emulsion with the increase of the oxyethylene (EO) group, and the growth of the alkyl chain can increase the stability of the emulsion to a small extent. For Gemini⁃type anionic⁃nonionic surfactants, the increase of the number of oxyethylene (EO) groups can increase the stability of the emulsion slightly. The monomer type has a smaller molecular size than the Gemini type, and the interfacial tension steady state value is generally low. At the same time, the addition of the polymer can increase the stability of the emulsion.

Key words: Anionic?nonionic surfactant, Heavy oil, Interfacial tension, Particle size, Stability