Prediction of Phase Equilibrium Conditions and Thermodynamic Stability of CO2-CH4 Gas Hydrate
With the large-scale promotion and application of CO2 flooding, more and more engineering problems have emerged. Due to the high CO2 mole fraction, the associated gas of CO2 flooding very easily forms solid hydrates, compared to conventional natural gas. This has resulted in production decline or sh...
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| Veröffentlicht in: | Applied sciences Jg. 14; H. 6; S. 2320 |
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| Abstract | With the large-scale promotion and application of CO2 flooding, more and more engineering problems have emerged. Due to the high CO2 mole fraction, the associated gas of CO2 flooding very easily forms solid hydrates, compared to conventional natural gas. This has resulted in production decline or shutdown. Understanding the phase equilibrium conditions for hydrate formation in production fluids is crucial for hydrate prevention and control. In this study, accurate predictions of CO2-CH4 mixed gas hydrate formation conditions were performed using theoretical models. The temperature and pressure ranges for hydrate formation were calculated for different CO2 mole fraction, ranging from −11.5 °C to 20.85 °C and from 0.81 MPa to −28.1 MPa, respectively. Based on the calculated phase equilibrium data, a multi-parameter empirical model was developed using polynomial fitting. The calculation errors for the multi-parameter empirical model were 3.09%. The multi-parameter empirical model established in this study can avoid complex thermodynamic equilibrium calculations and has the advantages of simplicity, high accuracy, and wide coverage of downhole conditions. Based on the calculated phase equilibrium data, the dissociation enthalpy of CO2-CH4 hydrate below and above the freezing point of water was calculated. The results showed that an increase in CO2 mole fraction led to an increase in hydrate dissociation enthalpy and enhanced thermodynamic stability, making hydrate prevention more challenging. Our work can contribute to the optimization of CO2 production fluid treatment processes and the development of hydrate prevention and control technologies. |
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| AbstractList | With the large-scale promotion and application of CO2 flooding, more and more engineering problems have emerged. Due to the high CO2 mole fraction, the associated gas of CO2 flooding very easily forms solid hydrates, compared to conventional natural gas. This has resulted in production decline or shutdown. Understanding the phase equilibrium conditions for hydrate formation in production fluids is crucial for hydrate prevention and control. In this study, accurate predictions of CO2-CH4 mixed gas hydrate formation conditions were performed using theoretical models. The temperature and pressure ranges for hydrate formation were calculated for different CO2 mole fraction, ranging from −11.5 °C to 20.85 °C and from 0.81 MPa to −28.1 MPa, respectively. Based on the calculated phase equilibrium data, a multi-parameter empirical model was developed using polynomial fitting. The calculation errors for the multi-parameter empirical model were 3.09%. The multi-parameter empirical model established in this study can avoid complex thermodynamic equilibrium calculations and has the advantages of simplicity, high accuracy, and wide coverage of downhole conditions. Based on the calculated phase equilibrium data, the dissociation enthalpy of CO2-CH4 hydrate below and above the freezing point of water was calculated. The results showed that an increase in CO2 mole fraction led to an increase in hydrate dissociation enthalpy and enhanced thermodynamic stability, making hydrate prevention more challenging. Our work can contribute to the optimization of CO2 production fluid treatment processes and the development of hydrate prevention and control technologies. |
| Author | Kan, Jingyu Li, Nan Ma, Haoran Zhang, Yunyi Li, Jingming Liu, Jiaqi |
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| Cites_doi | 10.1016/j.fuel.2022.127071 10.1016/j.apenergy.2019.02.022 10.1252/jcej.29.478 10.1021/je800396v 10.1201/9781420008494 10.1016/j.rser.2020.110521 10.1016/j.enpol.2021.112510 10.1021/acs.energyfuels.5b03001 10.1016/j.petsci.2021.12.007 10.1016/j.cej.2015.01.023 10.1016/j.apenergy.2020.115843 10.1021/je00001a020 10.3390/app10155052 10.1016/j.fuel.2022.126871 10.1016/j.jngse.2018.08.002 10.1016/j.jngse.2016.12.025 10.1016/S1385-8947(98)00126-0 10.1021/acs.energyfuels.0c03977 10.1016/j.jngse.2017.07.034 10.1016/j.jgsce.2023.204999 10.1039/C8CS00989A 10.1016/j.enconman.2017.01.043 10.1038/s41598-019-52745-x 10.1016/j.fluid.2010.03.038 10.1002/aic.690260604 10.3390/app11020469 |
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| SubjectTerms | Accuracy Carbon CO2-CH4 mixed gas Enhanced oil recovery Equilibrium formation conditions gas hydrates Gases Natural gas prediction Prevention Temperature |
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| Title | Prediction of Phase Equilibrium Conditions and Thermodynamic Stability of CO2-CH4 Gas Hydrate |
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