Abstract
CO2 replacement is a promising technology that simultaneously produces methane and carbon dioxide sequestration. In this work, a novel gradual heat injection enhanced replacement method (GHIR) was proposed to improve the methane production from natural gas hydrate sedimentary layer. The effects of heat injection mode on methane recovery, energy efficiency and the optimal operating conditions of GHIR were studied. The results have shown that GHIR enhances the CH4 recovery percentage from 8.0% to 25.4%. EROI could be further enhanced to 20.14. Because the thermal conductivity of hydrate is larger than the dissociation hydrate layer, the heat transfer analysis shown that the incremental heat injection enhanced replacement method (IHIR) is the best mode for gradual heat stimulation combined CO2 replacement. This work provides a novel method for future marine NGH development and promotes carbon sequestration by applying the CH4/CO2 replacement method.
Published Version
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