The study on non-ionic gemini surfactant and polymer foam system application in EOR

摘要

The foam is a viscoelastic fluid, and has a larger flow resistance than polymer. Therefore, foam flooding is a great potential for EOR technology, in order to study the non-ionic gemini surfactant and polymer system foam property. The interfacial activity, foam property, and flow resistance were investigated under the Daqing oil reservoir condition. The experiment shows that the ultra-low interfacial tension is acquired between oil and the binary system with the surfactant concentration range of 0.1 wt% and 0.4 wt% and polymer concentration less than 0.15 wt%. The foam composite index of the binary system is very good, when the surfactant concentration is greater than 0.4 wt%, with polymer concentration of 0.15 wt%. The foam resistance factor increases as the surfactant and polymer concentration increases. There is a matching relationship between the foam system mobility control ability and core permeability. The same foam system cannot improve the flooding control ability of all different permeability cores.