Thermodynamic calculation studies on oil composition and water presence effect on the minimum miscibility pressure of the CO2/two-components oil system
Minimum Miscibility Pressure (MMP) is a key parameter for guiding the CO2 Enhanced Oil Recovery (EOR) as well as carbon geological storage applications. In this work, a thermodynamic calculation study is performed concerning the oil composition and the water presence effect on the MMP properties of...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
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| Series: | Chemical Thermodynamics and Thermal Analysis |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667312625000239 |
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| Summary: | Minimum Miscibility Pressure (MMP) is a key parameter for guiding the CO2 Enhanced Oil Recovery (EOR) as well as carbon geological storage applications. In this work, a thermodynamic calculation study is performed concerning the oil composition and the water presence effect on the MMP properties of the CO2/multicomponent oil system under various temperatures. Two-components oils with different n-C14H30 and n-C19H40 ratios at 7:3, 6:4, 5:5, 4:6 and 3:7, are employed to reveal the oil composition effect on MMPs of CO2/oil system. Via introducing saturated water into CO2, the effect of water presence on MMPs of the CO2/oil system is studied as well. Thermodynamic calculation results show the MMP of the CO2/two-components oil systems increases from 8.5 MPa to 9.8 MPa, 10.1 MPa to 11.2 MPa, 11.6 MPa to 12.6 MPa, 12.9 MPa to 13.8 MPa, and 14.2 MPa to 15.0 MPa, together with the increasing portion of the heavier C19 oil component from 30 % to 70 % at various temperatures of 40 °C, 50 °C, 60 °C, 70 °C and 80 °C, respectively. Calculation results also reveal the presence of the water component would reduce the MMPs of the CO2/oil system by 0.2–0.8 MPa compared with the water absence case in the studied oil component and temperature conditions. In particular, the water presence effect on MMP reduction is more significant for the oils with higher portion of heavy components. |
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| ISSN: | 2667-3126 |