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Abstract
The orthogonal-test-design method was used to determine the optimum prescription of middle-phase microemulsion for tertiary oil recovery. The results indicate that in the petrolium sulphonate(PS) – the mixed alcohols(iso-propanol and n-butanol) - mineral water(7000ppm) – simulating oil(kerosen with 5.0% crude oil added) system, the optimum composition of the middle-phase microemulsion contains 2.0%PS and 2.2% the mixed alcohols(the weight ratio between iso-propanol and n-butanol is 9:1). The values of solubilization parameter, interfacial tension, and efficiency for oil recovery are 11.5ml/g, 3.30 ×10-4mN/m, and 94.6% respectively for the optimum flooding system.