<![CDATA[Background: Petroleum is a very important natural resource in the world energy industry. However, the process of extracting oil from underground reservoirs often faces various problems, one of which is suboptimal oil recovery. Objective: To increase the efficiency and optimization of oil extraction results, much research has been carried out. Method: In developing methods with additional ingredients, such as surfactants. One group of surfactants that can be used in this process is Methyl Ester Sulfonate (MES) surfactants, where this stage includes the Enhanced Oil Recovery method. In this laboratory research, one surfactant solution was used, namely MES Surfactant with varying concentrations of 5, 6 and 7% with a salinity of 12,000 ppm. This research aims to see how effective MES surfactant is in chemical injection. MES surfactant injection is carried out to increase oil production in the reservoir. In this research, there are various stages for MES surfactant to be declared effective in oil sweeping, including a compatibility test, density test, phase behavior test, interfacial tension test, and core flooding test. The use of surfactant to reduce interfacial tension so that an ift test is carried out. The aim of density measurements is to determine the density of the MES surfactant solution. Test the phase behavior to determine how stable the MES solution is. Results: The IFT (interfacial tension) results of the MES surfactant solution were determined from the results of the stable phase behavior test because this is the critical micelle concentration (CMC) point so that it can properly reduce the interfacial tension between oil and formation water in the reservoir. The interfacial tension value was obtained at 4 dyne/cm. The core used is sandstone which has known core dimensions, bulk volume, pore volume, porosity and permeability. At oil saturation, crude oil is injected to determine how much Original Oil is in Place. after that the core flooding process to determine the recovery factor. Conclusion: In core flooding, the solution used has reached the CMC point with a MES surfactant recovery factor with a concentration of 6% at the CMC point with a recovery factor of 19.44% for surfactant injection and an RF value for water injection or waterflooding of 41.67%.]]>
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