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Keywords: ASP flooding; Produced liquid; Weak base; Interface characteristics Abstract. ASP flooding has been proved to be an effective method to enhance oil recovery. But residual alkaline in produced liquid have resulted in stable crude oil emulsion, the difficulty of separating oil and water is obviously increased. Based on interface tension experiment, emulsification experiment and potential experiment, this paper studied the weak base ASP flooding. Experimental results show that: the stronger the alkalinity, the greater the degree of emulsification, the more stable the emulsion, the more difficult to separate water and oil. The emulsifying capacity of weak base ASP flooding is less than strong base ASP flooding.

Study on the interface characteristics of the weak base ASP flooding produced liquid