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.

中文翻译：

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以高速率二氧化碳注入储层的 CH4 水合物转化为 CO2 水合物的数学模型

摘要-

提出了以高速率将二氧化碳注入储层中的水合物中的二氧化碳置换甲烷的数学模型。置换反应区由甲烷水合物转化为二氧化碳水合物的前沿模拟。与考虑形成两个相变表面的方案进行比较，即CH _{4水合物的解离前沿和CO 2}水合物的形成前沿。结果表明，高注入压力抑制了甲烷水合物的解离，并且没有实施置换反应。由于储层中有大量的水合物，只有部分形成了二氧化碳水合物。构建了置换反应模式的临界图。