Replacement of Methane as Part of the Gas Hydrate by Carbon Dioxide in the Stratum with Negative Temperature

The authors have constructed a mathematical model of replacement of methane as part of the hydrate in a stratum saturated with methane and its hydrate under the conditions of negative temperatures upon the injection of carbon dioxide. An analysis has been made of the influence of the permeability, porosity, and length of the stratum, the initial saturation of the methane hydrate, and the coefficient of diffusion through the layer of CO 2 hydrate on the mass of the extracted mixture of methane and carbon dioxide. Basic possible variants of extraction of methane from the stratum depending on the relation of the characteristic times of filling of the stratum with carbon dioxide and on the kinetics of phase transitions have been shown.