Production characteristics of gas hydrate reservoirs associated with steam injection and depressurisation rate

초록

This study examined the gas production characteristics of gas hydrate using steam injection and depressurisation methods for representatives of unconsolidated reservoirs. The properties of the gas production rate were analysed at 20% depressurisation following the steam temperature (280 and 300 degrees C) and steam injection time (30, 60, and 200 s) in an unconsolidated artificial reservoir in a 3D experiment. The dissociation time and gas production rate were analysed according to the depressurisation rate (40%, 50%, and 60%) under constant gas hydrate saturation in an unconsolidated artificial reservoir in a 1D experiment. The results showed that the production of methane gas increases with increasing gas saturation and longer steam injection time at a low temperature (280 degrees C) compared to a high temperature (300 degrees C). In addition, the use of hot water provided better efficiency than steam in terms of maintaining the heat for dissociation and production processes.

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