期刊
ENERGY
卷 125, 期 -, 页码 62-71出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2017.02.104
关键词
Hydrate; Dissociation; Depressurization; Horizontal well; Entropy analysis
资金
- National Science Fund for Distinguished Young Scholars of China [51225603]
- National Natural Science Foundation of China [51676190, 51406210]
- National Key Technology Support Program [2014BAC21B03]
- National Key Research and Development Plan of China [2016YFC0304002]
- Key Arrangement Programs of the Chinese Academy of Sciences [KGZD-EW-301-2]
Based on the hydrate conditions of the South China Sea, hydrate samples were synthesized in the Cubic Hydrate Simulator (CHS) and the Pilot-Scale Hydrate Simulator (PHS), and hydrate dissociation experiments by depressurization with single horizontal well were carried out. In order to illuminate the characteristic of the irreversible energy loss during the gas production process in a large-scale hydrate simulator and a smaller hydrate simulator, the entropy generation model was established. Results show that the evolutions of the pressure, temperature, gas production, and water production during hydrate dissociation process with different scales of hydrate reservoir are similar. Moreover, entropy generation in the mixed gas release stage is the largest. In addition, in the dissociated gas release stage, the ratio of entropy generation decreases remarkably with the increase of the hydrate reservoir scale, and constant pressure depressurization method is favorable for hydrate dissociation in a larger scale hydrate reservoir. (C) 2017 Elsevier Ltd. All rights reserved.
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