关键词: 非离子G e m i n i表面活性剂, 二元泡沫性能,  , 界面性能,  , 泡沫复合驱, 气液体积比

Abstract: The binary system properties including interfacial tension, foam properties and oil displacement effect of nonionic Gemini surfactant and polymer were studied using interfacial tensiometer, foam scanner and foam flooding equipment. The results showed that the binary system had the ultralow surface tension with Daqing crude oil. The surface tension of binary system was increased with rising concentration of nonionic Gemini surfactant and polymer. The foam index of binary system had a maximum when concentration of nonionic Gemini surfactant and polymer was increased. The binary foam composite flooding recovery was increased with rising concentration of nonionic Gemini surfactant and polymer. As gas liquid ratio was improved, the binary foam composite flooding recovery first increased, and then decreased. When the gas liquid ratio was 1∶1, the oil displacement effect was best. The phenomenon of gas breakthrough occurred easily when the gas liquid ratio was bigger, and then the oil recovery effect declined. The higher the pressure was, the worst the foam flooding recovery effect was.

Key words: Nonionic Gemini surfactant,     ,  Binary foam property,    ,  Interfacial property,    ,  Foam combination flooding,   ,  Gas liquid ratio