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论文类型：期刊论文

发表时间：2017-07-05

发表刊物：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录刊物：SCIE、EI、Scopus

卷号：56

期号：26

页面范围：7585-7592

ISSN号：0888-5885

摘要：The application of air or nitrogen injection to extract natural gas from hydrates has attracted considerable attention because air and nitrogen are abundant; however, few studies have considered the relatively new method. This study employed magnetic resonance imaging to investigate the characteristics of hydrate dissociation via N-2 injection. The results show that methane hydrate dissociation using N-2 injection can be divided into three main stages: free gas and water liberation, hydrate dissociation driven by chemical potential differences, and restriction of hydrate dissociation due to increased resistance to N-2 diffusion and a decreased contact area between N-2 and hydrate. Various factors associated with the N-2 injection method were considered, including injection rate and hydrate saturation. Furthermore, a comparison of recovery injection ratio and methane cumulative production ratio to the results of hydrate dissociation via depressurization suggests that during low-hydrate saturation exploitation, N-2 injection has advantages over the depressurization method.