Assessment of Miscible Injection into a Basin Field in Kazakhstan: A Comparative Study of Hydrocarbon Gases, Nitrogen, and Carbon Dioxide

Khusain B. Logvinenko A. Kenessary A. Tyulebayeva R. Ismailova J. Delikesheva D.
August, 2025 Dr D. Pylarinos

Engineering, Technology and Applied Science Research
2025 #15 Issue 4 25677 - 25687 pp.

This research investigated the miscible gas injection for Enhanced Oil Recovery (EOR) in a carbonate reservoir in Kazakhstan. Five mixtures, each containing varying percentages of methane, ethane, propane, carbon dioxide, and nitrogen, were studied to determine their Minimum Miscibility Pressure (MMP) values through PVT_i and slim tube tests. Among them, mixtures #2 (CH₄ and C₃H₈) and #4 (pure CO₂) exhibited the best performance, with mixture #2 achieving the lowest MMP value, while CO₂ showed the best miscibility at lower pressures and the option of potential carbon sequestration. Most of the results were supported by slim tube experiments, compositional simulations (Eclipse), and phase behavior analysis using Gibbs triangles and ternary diagrams. The study contributed to the EOR research by incorporating multi-component gas evaluation and advanced phase visualization, thereby filling the gaps by previous works focused on single gases. The key findings emphasized the need to balance the technical efficiency, environmental sustainability, and operational viability in gas selection, providing critical insights for optimizing the EOR strategies in similar reservoirs.

carbon dioxide , minimum miscibility pressure , phase diagram , PVT

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D.V. Sokolsky Institute of Fuel, Catalysis and Electrochemistry, Almaty, 050010, Kazakhstan
Kazakh Institute of Oil and Gas, Almaty, 050000, Kazakhstan
Satbayev University, Almaty, 050000, Kazakhstan

D.V. Sokolsky Institute of Fuel
Kazakh Institute of Oil and Gas
Satbayev University

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