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Energies 2018, 11(1), 240; https://doi.org/10.3390/en11010240

Gas-Lifting Characteristics of Methane-Water Mixture and Its Potential Application for Self-Eruption Production of Marine Natural Gas Hydrates

1,2,4
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1,2,3,* , 1,2,3
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1
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
2
Key Laboratory of Gas Hydrate, Chinese Academy of Sciences and Guangzhou Center for Gas Hydrate Research, CAS, Guangzhou 510640, China
3
Guangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
4
University of the Chinese Academy of Sciences, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Received: 1 December 2017 / Revised: 8 January 2018 / Accepted: 16 January 2018 / Published: 19 January 2018
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Abstract

A gas-lifting production method was firstly proposed to transport the methane-water mixture from natural gas hydrates deposits through marine vertical pipe in this work. Aiming at UBGH2-6 site, SH7 site and GMGS2-8 site, the gas-lifting performance of methane-water mixture in the vertical pipe was investigated by numerical calculation. The potential of Natural gas hydrates (NGH) self-eruption production induced by the gas-lifting process under ideal conditions was also studied based on the energy analysis. The calculation results indicate that the gas-lifting method has great advantage in avoiding the secondary hydrates formation in marine vertical pipe and reducing energy consumption. The gas-lifting process in the vertical pipe is testified to be spontaneous in UBGH2-6 site and SH7 site during the initial 4000 and 1000 days, respectively, which indicates the energy consumption for methane-water mixture transportation is saved. Sufficient heat supply for the hydrate dissociation is crucial for the NGH self-eruption production. Sensitivity analysis indicates that the water-gas ratio has more significant influences on gas-lifting performance in the vertical pipe compared to the flow rate. With the decrease of water-gas ratio, the bottomhole pressure decreases rapidly. Thus, the reduction of water production is effective to improve the gas-lifting performance. View Full-Text
Keywords: methane hydrates; two-phase flow; vertical pipe; gas-lifting; Natural gas hydrates (NGH) self-eruption production; bottomhole pressure methane hydrates; two-phase flow; vertical pipe; gas-lifting; Natural gas hydrates (NGH) self-eruption production; bottomhole pressure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhang, J.; Li, X.; Chen, Z.; Zhang, Y.; Li, G.; Yan, K.; Lv, T. Gas-Lifting Characteristics of Methane-Water Mixture and Its Potential Application for Self-Eruption Production of Marine Natural Gas Hydrates. Energies 2018, 11, 240.

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