Abstract
Injection of liquid carbon dioxide into a depleted natural gas field is investigated. A mathematical model of the process which takes into account forming CO2 hydrate and methane displacement is suggested. An asymptotic solution of the problem is found in the one-dimensional approximation. It is shown that three injection regimes can exist depending on the parameters. In the case of weak injection, liquid carbon dioxide boils up with formation of carbon-dioxide gas. The intense regime is characterized by formation of CO2 hydrate or a mixture of CO2 and CH4 hydrates. Critical diagrams of the process which determine the parameter ranges of the corresponding regimes are plotted.
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