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Hydrate decomposition front within porous media under thermal stimulation and depressurization conditions: Macroscale to microscale

文献类型：期刊论文

作者Kou, Xuan1,2,3,4,5; Li, Xiao-Sen1,3,4,5; Wang, Yi1,3,4,5; Chen, Zhao-Yang1,3,4,5
刊名INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
出版日期2022-06-01
卷号188页码:13
关键词Gas hydrate Decomposition front Heat and mass transfer Thermal stimulation Depressurization X-CT
ISSN号0017-9310
DOI10.1016/j.ijheatmasstransfer.2022.122653
通讯作者Li, Xiao-Sen(lixs@ms.giec.ac.cn) ; Wang, Yi(wangyi@ms.giec.ac.cn)
英文摘要Natural gas hydrates are unstable and easily to be decomposed under warming or depressurizing condition. The complicated hydrate decomposition process is generally characterized by a moving decomposition front, yet the essence of decomposition front evolution is unclear and the evidence is lacking. In this study, X-ray computed tomography (X-CT) technology is used to reveal the dynamic process of macroscale and microscale evolution of hydrate decomposition front. The hydrate-bearing porous samples are synthesized in the high-pressure reactor and then decomposed by the thermal stimulation method and the depressurization method with X-CT scans in real time. Macroscale results show that isolated hydrates beyond the decomposition front remain undecomposed under both two decomposition conditions, indicating the oversimplification of the decomposition front as the boundary where gas hydrates are completely decomposed. Hence, the decomposition front is redefined as the boundary which divides the hydrate-bearing sediment into an interconnected zone and an isolated zone based on the interconnectivity of hydrate particles. Microscale hydrate decomposition behaviors show that, the heat transfer differences among pores, solid media, and gas hydrates under thermal stimulation condition result in the remnant of isolated hydrates beyond the outside-in moving decomposition front. The gas fugacity differences in gas phase, water layer, and dead-end pores under depressurization condition result in the remnant of isolated hydrates beyond the top-down moving decomposition front. More importantly, we found that the remnant grain-cementing hydrates could alter the thermal-hydro-mechanical-chemical (THMC) processes outside the decomposition front, and play important roles in formation stability and ecological environment by supporting the skeleton structure of hydrate-bearing sediments. These findings may provide implications and visual evidences for production efficiency improvement and environmental protection in future field tests of hydrate exploitation. (c) 2022 Elsevier Ltd. All rights reserved.
WOS关键词SOUTH CHINA SEA ; METHANE HYDRATE ; GAS HYDRATE ; DISSOCIATION FRONT ; PORE HABIT ; TEST-SITE ; RESERVOIR ; PERMEABILITY ; EVOLUTION ; KINETICS
资助项目Key Program of National Natural Science Foundation of China[51736009] ; National Natural Science Foundation of China[52122602] ; National Natural Science Foundation of China[42022046] ; National Natural Science Foundation of China[51806251] ; Guangdong Special Support Program-Local innovation and entrepreneurship team project[2019BT02L278] ; Youth Innovation Promotion Association CAS[2018382] ; Science and Technology Apparatus Development Program of the Chinese Academy of Sciences[YJKYYQ20200061] ; Fundamental Research & Applied Fundamental Research Major Project of Guangdong Province[2019B030302004] ; Fundamental Research & Applied Fundamental Research Major Project of Guangdong Province[2020B0301030003]
WOS研究方向Thermodynamics ; Engineering ; Mechanics
语种英语
WOS记录号WOS:000755663000002
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Key Program of National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong Special Support Program-Local innovation and entrepreneurship team project ; Youth Innovation Promotion Association CAS ; Science and Technology Apparatus Development Program of the Chinese Academy of Sciences ; Fundamental Research & Applied Fundamental Research Major Project of Guangdong Province
源URL[http://ir.giec.ac.cn/handle/344007/35881]  
专题中国科学院广州能源研究所
通讯作者Li, Xiao-Sen; Wang, Yi
作者单位1.Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100083, Peoples R China
3.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China
4.CAS Key Lab Gas Hydrate, Guangzhou 510640, Peoples R China
5.Guangdong Prov Key Lab New & Renewable Energy Res, Guangzhou 510640, Peoples R China
推荐引用方式
GB/T 7714		 Kou, Xuan,Li, Xiao-Sen,Wang, Yi,et al. Hydrate decomposition front within porous media under thermal stimulation and depressurization conditions: Macroscale to microscale[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2022,188:13.
APA Kou, Xuan,Li, Xiao-Sen,Wang, Yi,&Chen, Zhao-Yang.(2022).Hydrate decomposition front within porous media under thermal stimulation and depressurization conditions: Macroscale to microscale.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,188,13.
MLA Kou, Xuan,et al."Hydrate decomposition front within porous media under thermal stimulation and depressurization conditions: Macroscale to microscale".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 188(2022):13.

入库方式： OAI收割

来源：广州能源研究所

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