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The Influence of the Concentration of Palm-Based MES Surfactant with 96% Ethanol Additive on Aqueous Ability and Phase Behavior in 39-degree API Crude Oil 1Departement of Petroleum Engineering, Universitas Trisakti, Jakarta, Indonesia Abstract This study examines Enhanced Oil Recovery (EOR) via surfactant flooding, specifically using plant-derived Methyl Ester Sulfonate (MES) surfactant from palm oil. It assesses MES surfactant^s impact on aqueous ability and phase behavior in a 39-degree API crude oil reservoir. In this study, varied surfactant concentrations, supplemented with 96% ethanol as a co-surfactant (ranging from 0.5% to 2%), underwent stability tests. These involved heating the solutions in test tubes at 60 degree Celsius for 2 weeks. Phase behavior tests combine palm-based MES surfactant and crude oil at equal volume ratios, forming an emulsion. The emulsion^s condition was observed over 3 weeks in an oven. The research results show clear and homogeneous MES surfactant solutions. The Phase Behavior test produced a stable middle-phase microemulsion at a 25.75% volume, maintained with a 2% MES surfactant concentration and 2% co-surfactant concentration. In contrast, the previous study without co-surfactant only yielded an upper-phase emulsion. From these results, it can be concluded that the addition of co-surfactant can transform upper-phase emulsion into middle-phase emulsion. In this study, palm-based MES surfactant can be used as a surfactant injection fluid, with a composition of 2% MES surfactant and 2% co-surfactant, resulting in a middle-phase microemulsion of 25.75%. Keywords: Microemulsion, Palm-based MES Surfactant, Aqueous Stability, Middle-Phase Emulsion, Surfactant Concentration, Co-surfactant Topic: Engineering |
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