High-efficient foam compound flooding agent for tertiary oil recovery and preparation method thereof

The invention relates to a high-efficient foam compound flooding agent for tertiary oil recovery and a preparation method thereof, belonging to the technical field of chemical flooding capable of improving the recovery ratio of crude oil from an oilfield. Surfactants used by the high-efficient foam compound flooding agent take sodium alpha-olefin sulfonate as a main surfactant, and the high-efficient foam compound flooding agent is prepared by compounding the surfactant with other anionic surfactants, amphoteric surfactants and anionic-nonionic surfactants. Compared with the prior art, the high-efficient compound flooding agent has the characteristics of good capability of reducing tension of an oil-water interface, good compatibility with high-salinity water, no influence of the salinity on the tension of the oil-water interface, small using quantity and the like. A compound flooding system can improve the recovery rate of the crude oil by above 17%.