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Energies 2014, 7(8), 4813-4834; doi:10.3390/en7084813
Article

Numerical Investigation of Hydrate Dissociation Performance in the South China Sea with Different Horizontal Well Configurations

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, 1,2,* , 1,2
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1 Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China 2 Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China 3 University of Chinese Academy of Sciences, Beijing 100083, China
* Author to whom correspondence should be addressed.
Received: 4 April 2014 / Revised: 3 July 2014 / Accepted: 16 July 2014 / Published: 28 July 2014
(This article belongs to the Special Issue Coastal Ocean Natural Gas Hydrate 2014)

Abstract

Based on the available measurement data and literature on the hydrate deposits of the South China Sea, a numerical simulation with a new dual horizontal well system has been carried out. Warm brine stimulation combined with depressurization is employed as the production method. Two horizontal wells were situated in the same horizontal plane and they were placed in the middle of the Hydrate-Bearing Layer (HBL). The warm brine is injected from the left well (LW) into the reservoir, and the right well (RW) acted as the producer under constant pressure. The simulation results show that the effects of hydrate dissociation rate, gas to water ratio, and energy ratio are all better than the previous work in which the dual horizontal wells are placed in the same vertical plane. In addition, the sensitivity analysis indicates that a higher injection rate can enhance the hydrate dissociation rate and gas production rate, while a lower injection rate gives a more favorable gas to water ratio and energy ratio.
Keywords: marine hydrate; gas production; depressurization; warm brine stimulation; dual horizontal wells; South China Sea marine hydrate; gas production; depressurization; warm brine stimulation; dual horizontal wells; South China Sea
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.

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MDPI and ACS Style

Feng, J.-C.; Li, X.-S.; Li, G.; Li, B.; Chen, Z.-Y.; Wang, Y. Numerical Investigation of Hydrate Dissociation Performance in the South China Sea with Different Horizontal Well Configurations. Energies 2014, 7, 4813-4834.

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