Effect of particle size, water saturation, inorganic salt and methane on the phase equilibrium of CO2 hydrates in sediments

Zhou, Xuebing; Fan, Shuanshi; Xu, Chenlu; Wen, Huiyun; Chuvilin, Evgeny; Liang, Deqing

doi:10.1016/j.fluid.2024.114234

Fluid Phase Equilibria

2025

DOI: 10.1016/j.fluid.2024.114234

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Effect of particle size, water saturation, inorganic salt and methane on the phase equilibrium of CO2 hydrates in sediments

Xuebing Zhou,

Shuanshi Fan,

Chenlu Xu

et al.

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Effect of CO2 Thickeners on CH4-CO2 Replacement in Hydrate-Bearing Sediment

Zhou,

Long

et al. 2024

JMSE

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CO2 fracturing is known as the best solution to improve the efficiency of the CO2 replacement of natural gas hydrates, but the effect of CO2 thickeners on CH4-CO2 replacement are barely noticed. In this work, the effect of four kinds of CO2 thickener—including DL-Lactic acid, polyvinyl acetate, ethyl trifluoroacetate and octamethyl trisiloxane—on the CH4-CO2 replacement in quartz sand was measured thermodynamically and kinetically. The results show that the majority of the CO2 thickeners had no effect on the equilibria of the CH4 and CO2 hydrates, except for DL-Lactic acid, where the temperature depression caused by the addition of 5.5 wt% DL-Lactic acid was about 0.52 and 0.48 K for the CH4 and CO2 hydrates, respectively. In the kinetic measurements, the CH4-CO2 replacement was promoted via the addition of the CO2 thickeners, except DL-Lactic acid. The CO2 thickeners were suggested to strengthen the CH4-CO2 replacement by enhancing the gas exchange in the pore space. Octamethyl trisiloxane, which could promote CH4 recovery and CO2 capture at a low concentration, was suggested to be an ideal CO2 thickener for CH4-CO2 replacement.

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Effect of CO2 Thickeners on CH4-CO2 Replacement in Hydrate-Bearing Sediment

Zhou,

Long

et al. 2024

JMSE

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show abstract

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Effect of particle size, water saturation, inorganic salt and methane on the phase equilibrium of CO2 hydrates in sediments

Cited by 1 publication

References 35 publications

Effect of CO2 Thickeners on CH4-CO2 Replacement in Hydrate-Bearing Sediment

Effect of CO2 Thickeners on CH4-CO2 Replacement in Hydrate-Bearing Sediment

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