I In this condition, Indonesia has been conducting oil exploration activities fora long time. Every year this activity causes the production rate to continue to decline,so that in the future the main source can no longer be relied on because the availabilityof materials is increasingly depleting. Therefore, the Enhanced Oil Recovery (EOR)method was developed. In this study, the EOR method used was chemical injection inthe form of surfactant injection. The methodology used in this study is a laboratorystudy, using AOS surfactant as a solution along with brine with different salinity levels,namely, 5,000 ppm, 10,000 ppm and 20,000 ppm along with surfactant concentrationsof 0.3%, 0.5% and 0.8 %. Then all variations of the surfactant were added withpineapple peel charcoal as an additive with a concentration of 0.3 grams, 0.5 grams and0.8 grams. . Where the AOS surfactant solution along with pineapple peel additiveswill be measured for physical properties such as density, viscosity, and InterfacialTension at temperatures of 30°C and 80°C. The value that will be used in this study isthe lowest value based on the Interfacial Tension value in a salinity solution of 20,000ppm along with a concentration of 0.8% at 26.8 dyne/cm, in brine at 26.5 dyne/cm, andin a solution containing 26.5 dyne/cm. Added additives at 20,000 ppm and aconcentration of 0.8% obtained a yield value of 23.8 dyne/cm. Then, the physicalproperties of the rock were tested in the form of permeability and porosity tests. Priorto the core flooding process, brine saturation was carried out by immersing the coresin brine for 24 hours, and weighing the wet weight of each core sample after brinesaturation. Then the oil saturation was carried out, after which brine was injected using a brine salinity of 20,000 ppm. Then the last is the surfactant injection process todetermine the addition of oil processing, and the total recovery factor is obtained. Fromthis study, the recovery factor was obtained at a concentration of 0.8%, with atemperature of 30 oC, the total RF water flooding values were 24% and 46%,respectively. For RF surfactants at a temperature of 30 oC at a concentration of 0.8%,the value is 12% and the AOS surfactant with the addition of pineapple peel charcoaladditive is 3%. Recovery factor at a concentration of 0.8% with a temperature of 30 oCobtained the total surfactant RF value of 36% and the AOS surfactant with the additionof pineapple peel charcoal by 49% flooding, dilakukan saturasi brine dengan cara dilakukannya perendaman core di dalambrine selama 24 jam, dan ditimbang berat basah dari masing-masing sample coresetelah disaturasi brine. Kemudian dilakukan saturasi minyak, setelah itu dilakukaninjeksi brine dengan menggunakan salinitas brine sebesar 20.000 ppm. Kemudian yangterakhir adalah proses injeksi surfaktan untuk mengetahui penambahan perolahanminyak, dan didapatkan total recovery factor. Dari penelitian ini, didapat hasil recoveryfactor pada konsentrasi 0,8%, dengan temperatur 30 oC didapatkan nilai RF total waterflooding sebesar 24% dan 46%. Untuk RF surfaktan pada temperatur 30 oC dikonsentrasi 0,8% didapatkan nilainya sebesar 12% dan surfaktan AOS penambahanaditif arang kulit nanas sebesar 3%. Recovery factor pada konsentrasi 0,8% dengantemperatur 30 oC didapatkan nilai RF total surfaktan sebesar 36% dan surfaktan AOSpenambahan arang kulit nanas sebesar 49%.