Main progress of the second gas hydrate trial production in the South China Sea

YE Jianliang; QIN Xuwen; XIE Wenwei; LU Hailong; MA Baojin; QIU Haijun; LIANG Jinqiang; LU Jing'an; KUANG Zenggui; LU Cheng; LIANG Qianyong; WEI Shipeng; YU Yanjiang; LIU Chunsheng; LI Bin; SHEN Kaixiang; SHI Haoxian; LU Qiuping; LI Jing; KOU Beibei; SONG Gang; LI Bo; ZHANG He'en; LU Hongfeng; MA Chao; DONG Yifei; BIAN Hang

doi:10.12029/gc20200301

GEOLOGY IN CHINA > 2020 > 47(3): 557-568. > DOI: 10.12029/gc20200301

YE Jianliang, QIN Xuwen, XIE Wenwei, LU Hailong, MA Baojin, QIU Haijun, LIANG Jinqiang, LU Jing'an, KUANG Zenggui, LU Cheng, LIANG Qianyong, WEI Shipeng, YU Yanjiang, LIU Chunsheng, LI Bin, SHEN Kaixiang, SHI Haoxian, LU Qiuping, LI Jing, KOU Beibei, SONG Gang, LI Bo, ZHANG He'en, LU Hongfeng, MA Chao, DONG Yifei, BIAN Hang. Main progress of the second gas hydrate trial production in the South China Sea[J]. GEOLOGY IN CHINA, 2020, 47(3): 557-568. DOI: 10.12029/gc20200301

Citation:

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Main progress of the second gas hydrate trial production in the South China Sea

1.
China Geological Survey, Beijing 100037, China
2.
Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510075, Guangdong, China
3.
Institute of Exploration Techniques, China Geological Survey, Langfang 065000, Hebei, China
4.
Peking University, Beijing 100871, China
5.
CNPC Offshore Engineering Co., Ltd., Beijing 100102, China
6.
Center of Oil and Natural Gas Resource Exploration, China Geological Survey, Beijing 100083, China
7.
Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou), Guangzhou 510000, Guangdong, China

Funds:

by China Geological Survey project of offshore natural gas hydrate production test DD20190226

by China Geological Survey project of offshore natural gas hydrate production test DD20190218

More Information

Received Date: May 11, 2020
Revised Date: May 20, 2020
Available Online: September 25, 2023

Graphical Abstract

Abstract

Abstract

The natural gas hydrates-bearing shaly silt reservoirs are considered to be the most difficult target in exploitation. The first trial production test of the gas hydrate in the South China Sea conducted in 2017 proved that the reservoir is exploitable. On the basis of the understanding of the previous trial production, optimization and fine description of hydrate deposits, numerical simulation and onshore tests, the second gas hydrate trial production test were carried out by the China Geological Survey in the Shenhu sea area of the South China Sea from October 2019 to April 2020. This trial production overcame a series of technical problems, such as well head stability, horizontal well drilling, reservoir stimulating and sand controlling and accurate depressurizing, and achieved continuous gas production for 30 days, with a total gas output of 861400 cubic meters and a daily average gas production of 28700 cubic meters, which is 5.57 times the first trial production, thus greatly increasing the daily gas production and total gas production. The results show that there existed no abnormal methane content in sea floor, sea water and atmosphere during the whole process. The success of this test shows that it is possible to efficiently and safely develop the gas hydrate in shaly silt reservoirs.
- gas hydrate,
- second trial production,
- horizontal well,
- reservoir stimulation,
- environmental impact,
- oil and gas exploration engineering,
- the South China Sea

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Main progress of the second gas hydrate trial production in the South China Sea