| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
SHAO Mingjuan, WANG Pingkang, WU Lushan, ZHANG Wei, TIAN Qianning. A comparative analysis of offshore gas hydrates production test in Japan[J]. Marine Geology Frontiers, 2022, 38(12): 8-15. doi: 10.16028/j.1009-2722.2021.238
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A comparative analysis of offshore gas hydrates production test in Japan
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Abstract
At present, only China and Japan have implemented production test of offshore gas hydrates. The problems and lessons encountered in Japan shall be helpful to the hydrate research and development in China. The deployment, gas production, problem and research in Japanese two production tests completed in 2013 and 2017 in Nankai Trough were summarized, and the gas production of three production wells in two tests were compared. It was found that the two tests failed in solving the problem of the difference between actual and predicted gas production results, for which the characteristics and physical properties of hydrate reservoirs should have been the key issues. In addition, the production of hydrates is so complicated that sand control, decompression, drainage, etc., must be considered comprehensively, and balance between various production parameters required for stable production should be compromised.
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Keywords:
- natural gas hydrate /
- offshore production test /
- Japan /
- Nankai Trough
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References
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SHAO Mingjuan, WANG Pingkang, WU Lushan, ZHANG Wei, TIAN Qianning. A comparative analysis of offshore gas hydrates production test in Japan[J]. Marine Geology Frontiers, 2022, 38(12): 8-15. doi: 10.16028/j.1009-2722.2021.238
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Figure 1.
Wellhead locations and resistivity log data from the first （2013） and second （2017） offshore production test boreholes with corresponding sedimentary units[5]
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Figure 2.
Gas （red） and water （blue） production profiles of the AT1-P, P3 and P2 wells derived from measured temperature and density data[8]
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Figure 3.
Temporal changes in water production rate per unit drawdown and production section （PIw） of 3 wells （AT1-P, AT1-P3, and AT1-P2）（a）, and temporal changes in gas production rate per unit drawdown and production section （PIg） of the 3 wells（b）[8]
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Figure 4.
Measured and simulated gas and water production rates of production test in 2013 [14]