Potential of Gas-Enhanced Oil Recovery (EOR) Methods for High-Viscosity Oil: A Core Study from a Kazakhstani Reservoir

Karlygash Soltanbekova (), Gaukhar Ramazanova () and Uzak Zhapbasbayev
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Karlygash Soltanbekova: Scientific and Production Laboratory “Energy Modeling”, Satbayev University, Almaty 050013, Kazakhstan
Gaukhar Ramazanova: Scientific and Production Laboratory “Energy Modeling”, Satbayev University, Almaty 050013, Kazakhstan
Uzak Zhapbasbayev: Scientific and Production Laboratory “Energy Modeling”, Satbayev University, Almaty 050013, Kazakhstan

Energies, 2025, vol. 18, issue 15, 1-20

Abstract: At present, various advanced technologies for field development based on gas-enhanced oil recovery (EOR) methods are widely applied worldwide. These include high-pressure gas injection (hydrocarbon gases, nitrogen, flue gases), water-alternating-gas (WAG) injection, and carbon dioxide (CO 2 ) flooding. This study presents the results of filtration experiments investigating the application of gas EOR methods using core samples from a heavy oil reservoir. The primary objective of these experiments was to determine the oil displacement factor and analyze changes in interfacial tension upon injection of different gas agents. The following gases were utilized for modeling gas EOR processes: nitrogen (N 2 ), carbon dioxide (CO 2 ), and hydrocarbon gases (methane, propane). The core samples used in the study were obtained from the East Moldabek heavy oil field in Kazakhstan. Based on the results of the filtration experiments, carbon dioxide (CO 2 ) injection was identified as the most effective gas EOR method in terms of increasing the oil displacement factor, achieving an incremental displacement factor of 5.06%. Other gas injection methods demonstrated lower efficiency.

Keywords: enhanced oil recovery (EOR); core flooding; gas EOR; nitrogen (N 2 ) injection; carbon dioxide (CO 2 ) injection; hydrocarbon gas injection; displacement factor; interfacial tension (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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