Journal
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
Volume 94, Issue 8, Pages 1592-1598Publisher
WILEY-BLACKWELL
DOI: 10.1002/cjce.22529
Keywords
CO2/CH4 gas mixture; hydrate; thermodynamic; phase equilibrium; porous media
Categories
Funding
- National Natural Science Foundation of China [51576025, 51436003, 51106018]
- High-tech Research and Development Program of China [2013AA09250302]
- Program for Liaoning Excellent Talents in University [LJQ2014007]
- Fundamental Research Funds for the Central Universities of China
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CO2/CH4 replacement in hydrate exploitation is considered a promising method to enhance natural gas production and mitigate the greenhouse effect. Since the gas concentration in mining hydrate sediment changes with the displacement process, it is crucial to investigate the hydrate formation and dissociation characteristics with the presence of different gas mixtures. To obtain fundamental thermodynamic data, CO2/CH4 gas mixture hydrate phase equilibrium conditions in porous media were experimentally investigated. The experiments were conducted at 276.55-284.85 K and 2.10-6.80 MPa using an isochoric method with different CO2/CH4 gas mixture compositions (CO2 mole fractions were 0.798, 0.499, and 0.199 mol/mol (79.8, 49.9, and 19.9 mol%)). The results showed that gas mixtures with higher CO2 mole fractions had lower hydrate equilibrium pressure (p) under the same temperature (T) according to the experimental data. The two different porous media used in the experiments had a slight influence on gas mixture hydrate phase equilibrium conditions. An improved thermodynamic model was proposed to calculate the CO2/CH4 hydrate phase equilibrium conditions in porous media, and the prediction results fitted closely to the experimental data.
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