Preparation of nano emulsion with high salt resistance

In this paper, the high salt shale reservoir as the research object, through the combination of microemulsion dilution method and pseudo-ternary phase diagram to screen the salt resistance of good nano emulsion. In the system, D-limonene was used as the oil phase, and the surfactant CAB-35 and AOS were selected by pseudo-ternary phase diagram method as the surfactant in the ratio of 1:1, and then mixed with n-butanol in the ratio of 1:1 to obtain the best microemulsion effect. The nano emulsion system was prepared by diluting the microemulsion. By testing the interfacial tension, the optimum preparation conditions of nano emulsion were screened. The results showed that the nano emulsion prepared by dilution under the condition of 5:5 oil/water ratio of microemulsion system had the best ability to reduce the interfacial tension between oil and water.