Perpustakaan Digital ITB

In this research work, the effects of monovalent and divalent ions of different charges (Na+, Cl-, and SO42-) to the injecting brine of nonionic surfactant flooding have been studied by laboratory experimental work to optimize reducing interfacial tension between water and oil. Research has studied that nonionic surfactants are both effective and economical in boosting production from conventional and unconventional reservoirs. Though, studies into the performance of nonionic surfactants have been limited to reservoirs with temperatures below 200°F due to the temperature-dependent physiochemical properties, especially cloud point (CP). Therefore, a simulation study has also been conducted to predict the nonionic surfactant flooding performance in Field X with temperature below the cloud point temperature (CPT). This simulation was performed in inverted five spot patterns to determine the best scenario for surfactant flooding based on experimental results to the recovery factor in layered oil reservoir of Field X. The sensitivity analysis was carried out by varying the addition of sulfate ion to the brine composition of nonionic surfactant and surfactant flooding production injection ratio (PIR) to increase the oil recovery factor of Field X.