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

doi:10.1016/j.ijheatmasstransfer.2022.122653

GIEC OpenIR

	Hydrate decomposition front within porous media under thermal stimulation and depressurization conditions: Macroscale to microscale
	Kou, Xuan 1,2,3,4,5; Li, Xiao-Sen1,2,3,4 ; Wang, Yi 1,2,3,4; Chen, Zhao-Yang 1,2,3,4
	2022-06-01
发表期刊	INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
ISSN	0017-9310
卷号	188 页码:13
通讯作者	Li, Xiao-Sen(lixs@ms.giec.ac.cn) ; Wang, Yi(wangyi@ms.giec.ac.cn)
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.
关键词	Gas hydrate Decomposition front Heat and mass transfer Thermal stimulation Depressurization X-CT
DOI	10.1016/j.ijheatmasstransfer.2022.122653
关键词[WOS]	SOUTH CHINA SEA ; METHANE HYDRATE ; GAS HYDRATE ; DISSOCIATION FRONT ; PORE HABIT ; TEST-SITE ; RESERVOIR ; PERMEABILITY ; EVOLUTION ; KINETICS
收录类别	SCI
语种	英语
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
项目资助者	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
WOS类目	Thermodynamics ; Engineering, Mechanical ; Mechanics
WOS记录号	WOS:000755663000002
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/35882
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 Inst Energy Convers, Guangzhou 510640, Peoples R China 2.CAS Key Lab Gas Hydrate, Guangzhou 510640, Peoples R China 3.Guangdong Prov Key Lab New & Renewable Energy Res, Guangzhou 510640, Peoples R China 4.Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100083, Peoples R China
第一作者单位	中国科学院广州能源研究所
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.