Laboratory study on the performance of AOS surfactant in increasing oil recovery

Abstract

Abstract The decline in oil recovery in the oil and gas field is a problem that must be faced along with increasing energy needs. Efforts are made to increase oil recovery reserves with advanced methods, namely Enhanced Oil Recovery. In this study, an AOS (alpha olefin sulfonate) surfactant solution was used. Tests were conducted with varying concentrations at a salinity of 7,000 ppm. Phase behavior tests were also conducted for 7 days at 80 °C. The oil recovery value of the surfactant solution was also investigated. The testing stages carried out were density, interfacial tension, and core flooding tests. After making the surfactant solution sample, a density test was conducted at 30 and 80 °C. Finally, the core flooding test. The IFT results of the surfactant solution reached the critical micelle concentration (CMC) point so that it could reduce the interfacial tension well between oil and formation water in the reservoir with an interfacial tension value of 0.8212087 dyne/cm. Core flooding results are based on surfactants that reach the CMC point. There is a surfactant with a concentration of 1% Salinity 7,000 ppm at the CMC point with a recovery factor of 7.2727%.