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论文类型：会议论文

发表时间：2019-01-01

收录刊物：CPCI-S、EI

卷号：158

页面范围：5581-5586

关键字：Methane hydrate; hydrate exploitation; seawater flow; chemical potential difference

摘要：Natural gas hydrates (NGHs) are regarded as a potential energy source for the future. NGHs dissociation always accompanied by the migration of water. To understand the effect of water flow migration on hydrate dissociation, the visualization studies on the variation of hydrate distribution during seawater and water flow process was carried out in this study. The different back pressure was investigated, and the influence of temperature and pressure on MH dissociation was eliminated. The experimental results showed that seawater and water flow have promotion effect on ME dissociation, where the chemical potential difference between the hydrate phase and the aqueous phase caused MH dissociation. And the rate of MH dissociation increased with decreasing backpressure. The ME dissociation time in seawater flow process was longer than the time in the water flow process. During seawater flow process, the absolute permeability appearing increased with different stages. And seawater seepage, hydrate saturation and chemical potential difference were affected by each other. (C) 2019 The Authors. Published by Elsevier Ltd.