Havys, Hefizan (2025) Studi Perbandingan Injeksi Kimia Berbasis Kombinasi Alkali-Surfaktan-Polimer Dalam Peningkatan Perolehan Minyak: Studi Simulasi Lapangan D Menggunakan Cmg Stars. Other thesis, Universitas Islam Riau.

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Abstract

After the application of primary and secondary recovery methods, Field D still retains a significant amount of remaining oil due to high oil viscosity, an oil-wet rock condition, and an unfavorable mobility ratio (M > 1). To overcome these challenges, this study applies Chemical Enhanced Oil Recovery (CEOR) using an Alkali–Surfactant–Polymer (ASP) chemical combination through CMG STARS simulation. The chemical agents used include alkali NaOH at concentrations of 1.0 wt% and 2.0 wt%, Anionic Linear Alkyl Benzene Sulfonate surfactant at 0.4 wt%, 0.8 wt%, and 1.0 wt%, and xanthangum polymer at concentrations of 2000 ppm and 2500 ppm. This study aims to evaluate the performance potential of three chemical injection schemes—Alkali–Polymer (AP), Surfactant–Polymer (SP), and Alkali–Surfactant–Polymer (ASP)—in improving the recovery factor and cumulative oil production in the sandstone reservoir of Field D using an inverted five-spot injection pattern. In the base-case scenario (waterflooding), a recovery factor of 56% and a cumulative oil production of 1,888,000 bbl were obtained. The simulation results show that the AP scenario using 1.0 wt% NaOH and 2500 ppm polymer achieved a recovery factor of 71% and a cumulative oil production of 2,426,330 bbl. In the SP scenario, the combination of 0.8 wt% surfactant and 2500 ppm polymer produced the best performance with a recovery factor of 75% and a cumulative production of 2,546,810 bbl. Meanwhile, the highest performance was achieved by the ASP scenario using 1.0 wt% NaOH, 0.8 wt% surfactant, and 2500 ppm polymer, resulting in a recovery factor of 84% and a cumulative oil production of 2,854,090 bbl. The improvement observed in the ASP scenario is attributed to the synergistic effects of the three chemical components: alkali generates in-situ surfactants, surfactants reduce the oil–water interfacial tension, and polymers increase the viscosity of the injected fluid, thereby enhancing sweep efficiency. Overall, this study demonstrates that the ASP combination is the most effective method for increasing oil recovery in oil-wet sandstone reservoirs with high mobility ratios, and that the utilization of each chemical component contributes positively by providing additional oil recovery and improving the overall recovery factor.

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