Abstract:
In this paper, a numerical simulation of the process of methane displacement from a gas
hydrate reservoir during the injection of carbon dioxide followed by methane substitution by
carbon dioxide in the composition of the hydrate was performed. The process of gas replacement
was assumed to occur in a stable field of methane hydrates and carbon dioxide with CO$_2$ in a
gaseous state. The intensity of carbon dioxide hydrate formation was determined by diffusion of
carbon dioxide across the hydrate layer formed between a stream of the gas mixture and the
methane hydrate in the porous channels.
The general pressure of the system, the partial pressures of the carbon dioxide and methane,
the saturations of hydrates of carbon dioxide and methane, and the temperature as functions of
time were obtained. In the initial stage of the process, free methane was forced out, and
subsequently the methane received after the gas replacement process was extracted. This resulted
in a complete transition of methane hydrate into carbon dioxide hydrate and a complete extraction
of methane from the porous reservoir.
Keywords:gas hydrate reservoir, substitution of methane with carbon dioxide in the hydrate composition, diffusion, formation of gas hydrate.
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