Perpustakaan Digital ITB

This study investigates the formulation of an alkaline-enhanced mixed anionic sulfonate-based surfactant, focusing on the effects of ion composition on the recovery of light oil from synthetic brine. This study analyzes surfactant flooding and alkaline surfactant flooding in terms of interfacial tension (IFT), phase behavior, and recovery factor. Surfactant formulations incorporating AOS and LABS were evaluated using five synthetic brine compositions with differing salinities. The phase behavior results indicated that only a limited number of surfactants designs successfully attained Winsor Type III under high salinity conditions. Nonetheless, IFT values consistently surpassed ultra-low thresholds. The introduction of alkaline resulted in a significant reduction of interfacial tension to 0.0095 mN/m and improved microemulsion formation in specific cases. Stability issues, including emulsion separation and precipitation, were noted and may affect effectiveness. The study concludes that alkaline improves surfactant performance; however, optimal brine salinity and a stable formulation are essential for effective oil displacement.