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Experimental Simulation of the Exploitation of Natural Gas Hydrate
Energies 2012, 5(2), 518-530; doi:10.3390/en5020518
Article

Experimental Study on Methane Hydrate Dissociation by Depressurization in Porous Sediments

1,2
, 1,2,* , 1,2,3
 and 1,2,3
1 Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China 2 Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China 3 Graduate University of Chinese Academy of Sciences, Beijing 100083, China
* Author to whom correspondence should be addressed.
Received: 23 December 2011 / Revised: 6 February 2012 / Accepted: 7 February 2012 / Published: 22 February 2012
(This article belongs to the Special Issue Natural Gas Hydrate 2011)
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Abstract

Based on currently available data from site measurements in the Shenhu Area of the South China Sea, methane hydrate dissociation behavior by depressurization is studied in a one-dimensional experimental apparatus. According to time variation of temperature, resistance and gas production, the hydrate dissociation process is divided into three stages: free gas release, rapid dissociation and gradual dissociation. The experimental results show that as the hydrate saturation increases the proportion of hydrate decomposed decreases in the rapid dissociation stage. The hydrate dissociation rate and the dissociation heat increase as the dissociation pressure decreases. Furthermore, the decrease of the dissociation pressure works against the secondary formation of the hydrate.
Keywords: methane hydrate; depressurization; saturation; dissociation pressure; porous sediments methane hydrate; depressurization; saturation; dissociation pressure; porous sediments
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

Xiong, L.; Li, X.; Wang, Y.; Xu, C. Experimental Study on Methane Hydrate Dissociation by Depressurization in Porous Sediments. Energies 2012, 5, 518-530.

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