Effect of Residual Water in Sediments on the CO 2 -CH 4 Replacement Process

Fuqin Lu, Xuebing Zhou (), Caili Huang, Dongliang Li () and Deqing Liang
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Fuqin Lu: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Xuebing Zhou: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Caili Huang: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Dongliang Li: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Deqing Liang: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China

Energies, 2023, vol. 16, issue 7, 1-16

Abstract: CO 2 replacement is a promising method of gas hydrate recovery. However, the influence of residual water in the replacement process and selections of a suitable mining area remain uncertain. To better understand this method, we examined the influence of the particle size and initial hydrate saturation on the replacement process while using the same amount of residual free water. The results showed that during the replacement process, two stages of rapid reaction and slow reaction occurred, which were manifested by the speed of pressure change in the reactor. The CO 2 sequestration ratio decreased with the increase in sediment particle size and increased with the increase in initial hydrate saturation. During the replacement process, two reactions occurred: CH 4 was replaced by CO 2 and CO 2 hydrate was formed, and the replacement amount and recovery efficiency of CH 4 increased with a decrease in sediment particle size. When the sediment particle size was less than 166 μm, the CH 4 recovery efficiency was significantly affected by the particle size. The replacement amount of CH 4 increased with the increase in initial hydrate saturation, and the recovery efficiency decreased. This study provides a basis for selecting suitable hydrate-accumulation areas for on-site mining.

Keywords: methane hydrate; CO 2 replacement; residual water; sediment particle size; initial hydrate saturation; CH 4 recovery efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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