Linear stability and numerical analysis of gas hydrate dissociation in hydrate bearing sediments

被引:0
作者
Zhang, Yan
Wei, Jiangong [3 ,4 ,5 ]
Zhang, Xuhui [1 ,2 ]
Ren, Wanlong [1 ,2 ]
Lu, Xiaobing [1 ,2 ]
Guo, Hongsheng [6 ,7 ]
Wang, Tianju [6 ,7 ]
机构
[1] Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
[3] Guangzhou Marine Geol Survey, Sanya Inst South China Sea Geol, Sanya 572025, Peoples R China
[4] China Geol Survey, Acad South China Sea Geol Sci, Sanya 572025, Peoples R China
[5] Guangzhou Marine Geol Survey, MLR Key Lab Marine Mineral Resources, Guangzhou 510075, Peoples R China
[6] CPOE Res Inst Engn Technol, Tianjin 300451, Peoples R China
[7] CNPC Offshore Engn Co Ltd, Beijing 102600, Peoples R China
基金
中国博士后科学基金;
关键词
Gas hydrate; Hydrate bearing sediments; Linear stability; Hydrate dissociation; METHANE HYDRATE; KINETICS;
D O I
10.1016/j.apor.2024.104394
中图分类号
P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
The stability of gas hydrate (GH) dissociation is crucial for understanding and predicting various hazards triggered by GH dissociation, such as landslides and gas blowouts. This study employs linear stability analysis and numerical simulation approaches to investigate the dynamics of GH dissociation under depressurization and heating. An instability criterion is derived, emphasizing conditions where the environmental heat supply exceeds the heat absorption by GH. We analyze the spatial and temporal evolution of key parameters, such as pore pressure, GH volume fraction, temperature, and strength, across different dissociation zones within the sediment. It is observed that pore pressure and temperature increase rapidly over time in unstable conditions, resulting in GH dissociation completing in approximately 10 sand a sharp decrease in the strength of hydrate- bearing sediments (HBS). Our findings offer insights into the behavior of HBS during GH dissociation and elucidate the formation mechanism of potential hazards associated with GH dissociation.
引用
收藏
页数:7
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