T The decline in oil production in oil fields presents a significant challenge as the demand forpetroleum energy increases. One method to enhance oil production is by using surfactants inEnhanced Oil Recovery (EOR). This study tested two types of surfactant solutions, namely AOS(alpha olefin sulfonate) and ALS (ammonium lauryl sulfate), each with five differentconcentrations: 0.5%, 0.7%, 0.9%, 1.1%, and 1.3%, and a salinity of 9000 ppm. Surfactants werechosen for their ability to reduce interfacial tension. The study involved phase behavior testing toassess foam stability over 14 days at temperatures of 60°C and 80°C, and to determine the oilrecovery value from the surfactant solutions used. AOS surfactant was made from AOS powder,while ALS surfactant was made from liquid surfactant, then mixed with brine solution with asalinity of 9000 ppm. The testing stages included compatibility tests, density tests, viscosity tests,interfacial tension tests, adsorption tests, and core flooding tests. The compatibility test wasconducted to ensure that the surfactant solution did not produce sediment or foam, resulting in aperfect solution. The density test used a DMA-4100 densitometer to measure the density of AOSand ALS surfactant solutions at 60°C and 80°C to determine the effect of temperature on density.The viscosity test was conducted to determine the viscosity of the surfactant solution at the sametemperature. Next, the phase behavior test was conducted by mixing the surfactant solution andoil, then placing it in an oven at 60°C and 80°C for 14 days to obtain a stable emulsion. Theinterfacial tension test was conducted to measure the interfacial tension of the surfactant at 60°Cto determine the effect of temperature on interfacial tension. Finally, the core flooding test wasconducted to determine the amount of oil recovered from sandstone rock after surfactant injection.The results showed the effects of AOS and ALS surfactants on sandstone rock and their ability toreach the critical micelle concentration (CMC) to reduce interfacial tension between oil and waterin the reservoir. The recommended interfacial tension value is 10^-3 dyne/cm for more effective oilrecovery. In the core flooding test, AOS surfactant at a concentration of 1.3% and a salinity of9000 ppm reached the CMC with a recovery factor of 1.82% and an interfacial tension of0.8212077 dyne/cm. ALS surfactant at the same concentration achieved a recovery factor of30.83%, indicating that ALS surfactant is more effective in sweeping sandstone rock.