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

Author

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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)

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.

Suggested Citation

  • Karlygash Soltanbekova & Gaukhar Ramazanova & Uzak Zhapbasbayev, 2025. "Potential of Gas-Enhanced Oil Recovery (EOR) Methods for High-Viscosity Oil: A Core Study from a Kazakhstani Reservoir," Energies, MDPI, vol. 18(15), pages 1-20, August.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:15:p:4182-:d:1719208
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    References listed on IDEAS

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    1. Assel Zholdybayeva & Askar Syzdykov & Peyman Pourafshary & Jamilyam Ismailova & Dinara Delikesheva, 2024. "Importance of Clay Swelling on the Efficacy of Cyclic Steam Stimulation in the East Moldabek Formation in Kazakhstan," Energies, MDPI, vol. 17(20), pages 1-24, October.
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