Experimental And Numerical Investigation Of The Effects Of Propane And Butane Mixtures On The Minimum Miscibility Pressure (MMP) Of Crude Oil

Date

2025-8-27

Author

Soylu, Mehmet

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Given its implications for energy security and availability, increasing oil production from reservoirs is of critical importance. Considering the rising CO₂ emissions and their environmental impacts, using CO₂ for enhanced oil recovery (EOR) is a promising approach because it enables CO₂ sequestration while increasing the availability of energy resources. During EOR applications, CO₂ may be injected into the reservoir in miscible or immiscible states depending on the reservoir and oil properties. While miscible injection is preferred for higher recoveries, it may not be possible where the minimum miscibility pressure (MMP) of CO₂ with the oil is exceedingly high. In such cases, mid-weight hydrocarbons (C3-C7) such as propane and butane mixtures may be used to reduce the MMP. This study has combined theoretical, experimental, and modeling approaches to evaluate the impact of co-injecting propane and butane mixtures with CO₂ on the reduction of MMP. After the theoretical research, slim tube tests have been performed to determine the MMP of the oil as 204 bars, which has been verified via Ahmadi and Johns (2011) method as 206.89 bars in FluidModeler and 207.65 bars in Eclipse300 compositional simulation through Petrel. Due to its greater flexibility, the Eclipse300 simulation was preferred to investigate the effect of LPG, and the impact of co-injecting two LPG compositions with CO₂ at varying mole percentages (0–100%) was examined. Findings suggested co-injecting 0-17 mole% LPG with CO₂ resulted with the highest amount of MMP reduction per unit LPG with approximately 50% reduction at 17 mole%.

Subject Keywords

Enhanced Oil Recovery (EOR), CO2 Sequestration, Miscibility, Slim Tube Tests, Minimum Miscibility Pressure (MMP)

URI

https://hdl.handle.net/11511/116095

Collections

Graduate School of Natural and Applied Sciences, Thesis