Due to the current decline in oil production, it will cause quite a serious problem, this will cause consumption needs will not be fully met. In this case, to deal with the problem of declining oil production, an advanced oil extraction method known as Enhanced Oil Recovery (EOR) has been developed. The purpose is to choose a surfactant that compatible to one of the technologies fot the EOR method is chemical injection by injecting surfactants. The use of surfactants in chemical injection is to reduce the interfacial tension between oil and water. In this study, a phase behavior test will be carried out in order to find out what factors can affect the surfactant used. In this study, a phase behavior test was carried out by mixing crude oil and a surfactant. In this study, Alpha Olefin Sulfonates (AOS) surfactants will be used, using several variations of salinity 20,000 ppm, 40,000 ppm, 60,000 ppm, and 80,000 ppm and the surfactant concentrations are 0.5%, 1%, 1.5%, 2%, 2.5%. Each sample will be mixed with light oil and then put in an oven at 60°C and then it will be observed whether or not an emulsion will form. The behavioral test that has been carried out gives the result that the sample with a salinity of 60,000 ppm and a concentration of AOS 2.5% which forms a middle phase emulsion, the volume of the emulsion is 0.10 ml. So, this surfactant composition is compatible with crude oil samples for the implementation of chemical flooding with this crude oil sample.

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