期刊
ENERGY EXPLORATION & EXPLOITATION
卷 38, 期 6, 页码 2601-2617出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/0144598720941182
关键词
Natural gas hydrate; clayey sediment; hydrate replacement; methane recovery; carbon dioxide sequestration
资金
- National Natural Science Foundation of China [41672361, 41876218]
- Scientific and Technological Development Program of Jilin Province [20170414044GH]
- Provincial and School Co-construction project [SXGJSF2017-5]
The replacement of gas hydrate in clayey sediment by a CO2/N-2(20:80) gas mixture injection was experimentally studied to explore the influence of clay on the gas exchange behaviours in the gas hydrate. Clay (montmorillonite) and silica sand were mixed in three different proportions (clay mass ratios of 10%, 30% and 50%) to simulate the host sediments of natural gas hydrate while pure silica sand sediment was selected for comparison. Experimental results showed that clay hindered gas diffusion during the initial replacement stage and thus reduced the methane recovery rate. In the later stage, the gas exchange between CO2/N(2)and methane in the hydrate structure might be subject to thermodynamic inhibition and geometric constraints of the clay interlayer. Moreover, the CO(2)sequestration ratio was lowered significantly in the sediment with a 50% clay mass ratio. Therefore, it was determined that clay has an inhibitory effect on gas hydrate replacement by CO2/N-2.
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