Syafutra, Theo (2025) Analisa Perbandingan Metode Hybrid Alkali dengan Softened Water Pada Proses Injeksi Alkali Surfaktan Polimer (ASP) dalam Upaya Meningkatkan Perolehan Minyak di Lapangan Ts Menggunakan Simulator CMG Gem 2020. Other thesis, Universitas Islam Riau.

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Abstract

TS Field is one of the mature oil fields that still holds significant potential for oil recovery, with remaining reserves reaching 66.49% of the Original Oil in Place (OOIP). This study aims to analyze and compare the effectiveness of two chemical injection methods, Softened Water and Hybrid-Alkali, in the AlkalineSurfactant-Polymer (ASP) injection process using a three-dimensional numerical simulation conducted with CMG STARS software. The Softened Water method relies on injection water treated to remove divalent ions (Ca²⁺ and Mg²⁺) to prevent polymer degradation and surfactant precipitation. In contrast, the Hybrid-Alkali method utilizes a combination of alkalis (Na₂CO₃ and Na₃PO₄), enabling the formation of in-situ surfactants and offering greater tolerance to high salinity conditions. Simulation results indicate that the Hybrid-Alkali method consistently yields higher Recovery Factors (RF) and oil production volumes compared to the Softened Water method across all concentration variations. The maximum RF achieved by Hybrid-Alkali reached 14.05%, whereas Softened Water only achieved 9.94%. Therefore, the Hybrid-Alkali method is proven to be more effective and is recommended for implementation in the TS Field to optimize oil recovery under an Enhanced Oil Recovery (EOR) ASP scenario.

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