| Currently, the ASP flooding has entered the industrialization stage, but ASP flooding bringing about the difficulty in processing the produced liquid and formation damage caused to a large extent limitation to the populating ASP industrialization. By contrast, the binary compound flooding system without alkali is popular in the oil field with strong application on the spot. But as no alkali, petroleum acid active substances can not be fully utilized, so it is imperative to research and develop a new kind surfactants and non-alkali compound formula. In this paper, it mainly does the research on systematic evaluation on interfacial properties of the carboxyl betaine surfactant and sulfosalicylic and implements physical simulation experiments with the surfactant systems through the optimization of the surfactant adsorption experiments and the stability of oil displacement experiments.The results show in the following. The binary compound systems with the surfactants compound of SB4 and SB1 can form the ultralow interfacial tension at two concentration of surfactant, 0.05%, 0.025%; others only reach 10-2 mN/m. While the effect of the compound of SB4 and 11# is better, which can form ultralow IFT(<10-3mN/m) with crude oil in Daqing, and the concentration 0.2% has better stability, between 2×10-3and 4.5×10-3mN/m during 150 days' trial according to the proportion 1:1 of SB4 and 11#. We also find the best proportion of B-kind sulfosalicylic surfactant and 13# forming the ultralow IFT(10-3mN/m) with oil in six oil production plant of Daqing oil field. In surfactant systems, surfactant-polymer systems and alkali-surfactant-alkali systems, the absorption of sulfosalicylic surfactant is lower than that of carboxyl betaine surfactant, which is lower than that of heavy alkyl benzene sulfonate. According to the analysis of the results of experiments on the homogeneous cores and heterogeneous cores, we consider that the non-alkali binary compound flooding system with sulfosalicylic surfactant B have the same effect of flooding as the sodium hydroxide ternary alkali flooding system and the Ss weak-alkali ternary system.
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