Relative permeability and interfacial tension are key parameters to characterize chemical enhanced oil recovery. Chemical flooding, a modern technique of enhanced oil recovery is based on the principle of reduction in interfacial tension of oil/water system. The selection of suitable surfactant is important and it should be compatible in a single phase solution at reservoir conditions and can be capable of reducing the interfacial tension to about 10–3 dynes/cm. In this study, Alcohol Alkoxy sulfate sodium salt (AAS) has been used as a surfactant. AAS was found compatible for conducting core flood experiment and it also reduced the oil/water interfacial tension to a very low value by forming type III micro emulsion. A Berea sandstone core plug of 100md was used in the core flooding experiment. The experimental results showed significant decrease in water/oil interfacial tension of 29 dynes/cm to 4.15*10–4 dynes/cm. SendraTM estimation was used for the history matching between experimental data with simulated one. Recovery with water flooding was 59.28%, whereas with surfactants it was increased to 85.95%. Relative Permeability of oil was 0.92 with water flooding, whereas relative permeability of oil with surfactant flooding was 0.98. The comparative analysis showed that two phase region (oil-water) becomes wider when surfactant was used and also relative permeability of oil was increased with decrease in interfacial tension. This study shows that surfactants can be applied in most oil fields of Pakistan especially in Central Potwar region where oil API is in the range of 10–22◦, so they promise a bright future for Petroleum Industry in Pakistan.

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