The response of temperature and pressure of hydrate reservoirs in the first gas hydrate production test in South China Sea

•The gas production from hydrate dissociation accounting for about 85%.•Analysis of the radius of the hydrate dissociation area in this production test.•Five-year prediction of long-term influence radius of pressure drop.•Exploration of favorable areas for the formation of secondary hydrates.•Analys...

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Published in:Applied energy 2020-11, Vol.278, p.115649, Article 115649
Main Authors: Qin, Xuwen, Liang, Qianyong, Ye, Jianliang, Yang, Lin, Qiu, Haijun, Xie, Wenwei, Liang, Jinqiang, Lu, Jin'an, Lu, Cheng, Lu, Hailong, Ma, Baojin, Kuang, Zenggui, Wei, Jiangong, Lu, Hongfeng, Kou, Beibei
Format: Article
Language:English
Subjects:
Depressurization production
Marine gas hydrate
Pore pressure response
Secondary hydrate
Temperature response
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Summary:•The gas production from hydrate dissociation accounting for about 85%.•Analysis of the radius of the hydrate dissociation area in this production test.•Five-year prediction of long-term influence radius of pressure drop.•Exploration of favorable areas for the formation of secondary hydrates.•Analysis of the response of pressure and temperature of hydrate reservoirs. The first offshore natural gas hydrate production test of China in 2017 has proved the feasibility of hydrate exploitation from clayey-silt reservoirs, which possesses the highest reservoirs than other types of hydrate resources. However, owing to the absence of monitoring wells in this production test, the hydrate dissociation behavior cannot be analyzed through pressure and temperature changes of hydrate reservoirs. This paper focuses on the simulation study on the detailed response of the temperature and pore pressure of hydrate reservoirs of Well SHSC-4 during the gas production by depressurization. Meanwhile, it highlights the analysis of favorable areas for the formation of secondary hydrates and the influence of the secondary hydrates on pressure and temperature field of hydrate reservoirs. The simulation results indicate that in the first 60 days, the hydrate reservoirs feature a dissociation radius of about 5 m, and the gas production from hydrate dissociation accounts for about 85%. After 1 year, 2 years and 5 years of hydrate exploitation, the influence radius of low-pressure area (
ISSN:0306-2619
1872-9118
DOI:10.1016/j.apenergy.2020.115649