Perpustakaan Digital ITB

This research outlines a systematic method for optimizing Alkaline-Surfactant-Polymer (ASP) fluid design to improve light oil recovery, emphasizing the impact of brine ionic composition on process efficiency. Synthetic brines and crude oil from field X were employed to systematically assess various ASP formulations against critical performance metrics, including phase behavior, interfacial tension (IFT), and viscosity. Among the evaluated formulations, ASP-7, which includes Na?CO?, Alpha Olefin Sulfonate (AOS), and Hydrolyzed Polyacrylamide (HPAM) in high salinity brine with the ion composition of Na+, Cl-, Ca2+, Mg2+, SO42-, and CO32-, exhibited the most advantageous properties. This formulation resulted in an interfacial tension of 0.264 mN/m, demonstrated a viscosity comparable to that of crude oil, and preserved a favorable viscosity ratio, all of which are essential for efficient displacement. Spontaneous imbibition tests utilizing Berea sandstone cores demonstrated a notable enhancement in oil recovery, rising from an initial 16.1% to 50% of the original oil in place (OOIP) with the optimized ASP formulation. The findings highlight the critical importance of brine composition in the systematic design of ASP formulations, which directly influences fluid properties and ultimately determines the effectiveness of oil displacement in light oil reservoirs.