Effect of different solvent compositions on petroleum recovery in heavy oil reservoirs

Date

2025-8-18

Author

Nasirli, Toghrul

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Miscibility is a critical factor in the effectiveness of CO₂-based Enhanced Oil Recovery (EOR). In many heavy oil reservoirs, CO₂ injection remains immiscible under reservoir conditions, which limits its ability to reduce viscosity and achieve efficient displacement. To overcome these challenges, lighter hydrocarbon solvents such as propane and butane have been proposed as alternatives, due to their lower Minimum Miscibility Pressures (MMPs) and stronger miscibility potential. The Batı Raman Field in Türkiye, a mature heavy oil reservoir suffering from natural production decline, provides a representative case study for evaluating these strategies. In this work, slim tube simulations using Eclipse 300 were employed to determine the MMP of propane and butane, while CMG GEM was used to perform field-scale reservoir simulations. The results show that propane injection at its MMP (1690 psi) achieved over 9% additional cumulative oil recovery, reduced oil viscosity by nearly 9%, and lowered the CO₂ MMP from 3527 to 3325 psi, enabling the potential for miscible CO₂ flooding in future operations. Economically, the normalized scoring method that combined NPV and IRR demonstrated that 0.1 PV propane injection delivered the strongest overall performance.

Subject Keywords

EOR, Solvent Injection, Propane, Butane, MMP

URI

https://hdl.handle.net/11511/115537

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Graduate School of Natural and Applied Sciences, Thesis