Abstract
A mathematical model of the replacement of methane with carbon dioxide in hydrate at high rates of carbon dioxide injection into a reservoir is proposed. The replacement-reaction zone is modeled by the front of the methane hydrate conversion to carbon dioxide hydrate. A comparison is made with a regime that takes into account the formation of two surfaces of phase transitions, i.e., the front of dissociation of CH4 hydrate and the front of formation of CO2 hydrate. It is shown that a high injection pressure suppresses the dissociation of methane hydrate, and no replacement reaction is implemented. With significant volumes of hydrate in the reservoir, only a partial formation of carbon dioxide hydrate occurs. The critical diagram of the replacement-reaction modes is constructed.
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