Study on enhanced oil recovery using continuous CO2 injection and CO2-WAG injection in a carbonate reservoir at the North Khosedayu field, Russian Federation
Abstract
The paper evaluates the enhanced oil recovery potential of continuous CO₂ injection and CO₂ water-alternating-gas (CO₂-WAG) injection at the North Khosedayu field, Rusian Federation, based on slim-tube experiments, 1D modeling, and reservoir simulation. The results indicate that oil displacement efficiency increases markedly with injection pressure, reflecting the transition from immiscible to near-miscible and fully miscible displacement.
A reservoir simulation model was then built for a representative sector to evaluate four production scenarios: natural depletion, waterflooding, continuous CO₂ injection, and CO₂-WAG injection. The results show that waterflooding does not improve the recovery, whereas continuous CO₂ injection and CO₂-WAG injection significantly enhance oil recovery compared to natural depletion.
References
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Christophe McGlade, Glenn Sondak, and Mei Han, “Whatever happened to enhanced oil recovery?”, 27/11/2018. [Online]. Available: https://www.iea.org/commentaries/whatever-happened-to-enhanced-oil-recovery.
H. Hawez and Z. Ahmed, “Enhanced oil recovery by CO2 injection in carbonate reservoirs”, Energy and Sustainability V: Proceedings of 5th Energy and Sustainability International Conference, Kuala Lumpur, Malaysia, 16 - 18 December 2014.
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