| Our country has a large amount of petroleum reserves,but after the primary and secondary recovery,mostreservoirs entered a high water cut period , it is more and more difficult to stable the production of this oil field. Therefore, several projects for EOR have being carried out. Polymer flooding has been expanded in the big area of the daqing oil-field,becoming the important measure keeping the oil-field sustained development,and still extends.After large-scale polymer flooding industrialization application,however,it follows to also appear some problems.In some area polymer flooding has always reached the follow-up water flooding stage.after polymer flooding,how to further enhance oil recovery and keep the oil-field sustained development is important.Through the indoor physics imitating experiment, the main task is on the artificial homogeneous core (Kg=1000md,2000md, 4.5cm×4.5cm×30cm) to carry out after polymer flooding surfactant-polymer system further enhances oil recovery experiment research. Considering many factors , such as which effect flooding efficiency of the polymer-surfactant system ,surfactant concentration, polymer concentration, polymer molecular weight and slug size of the binary compound system ,and compares flooding efficiency of polymer-surfactant system , ternary compound system and the functional polymers , then in the core of binary system of natural oil displacement effect was verified.The results from paper show that oil recovery efficiency of binary compound flooding increases with surfactant concentration of the binary system, increases with polymer concentration of the dual system, the main slug size increases, etc. This research and project provides technical reserves for daqing oilfield on further enhance oil recovery after polymer flooding, and is the significance of daqing oilfield sustainable development.
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