Effect of reservoir goaf on methane recovery and carbon dioxide sequestration in sandy and clayey hydrate reservoirs:An experimental studyOA
Carbon dioxide(CO_(2))replacement is a promising technique for extracting natural gas hydrate(NGH,a promising clean energy source),capable of promoting energy development while mitigating the greenhouse effect.However,the improvement of NGH extraction efficiency in field engineering is hindered by the difficulty of CO_(2) injection and diffusion.To overcome these difficulties,this study proposes combining CO_(2) replacement with the solid fluidization method for the exploitation of NGH.The effects of solid fluidization mining goaf on methane(CH_(4))recovery and CO_(2) sequestration were experimentally investigated.The results indicate that the presence of a goaf in a sandy hydrate reservoir improves the CH_(4) recovery ratio and CO_(2) storage capacity due to its ability to provide a higher replacement driving force.However,the CO_(2) sequestration ratio in the goaf-containing reservoir is lower than that in the intact hydrate reservoir due to the influence of free water content.Besides increasing the replacement driving force,the goaf in the clayey hydrate reservoir can also enhance the diffusion of the replacement medium.The enhancement of CH_(4) recovery and CO_(2) storage amount per unit sediment volume is 5.3%and 22.8%,respectively.Moreover,the CO_(2) sequestration ratio in the goaf-containing hydrate reservoir is higher than that in the intact hydrate reservoir.These results provide theoretical support for the extraction of NGH via the CO_(2) replacement method.
Yun-shuang Zeng;Dong-bin Pan;Chen Chen;Yu Xie;Yang Zhou
Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy,Jiangxi University of Science and Technology,Ganzhou 341000,ChinaJiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy,Jiangxi University of Science and Technology,Ganzhou 341000,China Key Laboratory of Drilling and Exploitation Technology in Complex Conditions,Jilin University,Changchun 130026,ChinaKey Laboratory of Drilling and Exploitation Technology in Complex Conditions,Jilin University,Changchun 130026,ChinaJiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy,Jiangxi University of Science and Technology,Ganzhou 341000,ChinaJiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy,Jiangxi University of Science and Technology,Ganzhou 341000,China
能源科技
Natural gas hydrateCombustible iceClean energyCO_(2)sequestrationHydrate exploitationReservoir goafSolid fluidizationCarbon sequestrationCarbon capture,utilization,and storage(CCUS)
《China Geology》 2026 (3)
P.624-634,11
supported by the National Natural Science Foundation of China(42562030)Jiangxi Provincial Natural Science Foundation(20252BAC240263)High-level Talent Project of Jiangxi University of Science and Technology(205200100560)Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy(2023SSY01071)。
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