Numerical study of the process of injection carbon dioxide into a porous formation saturated with methane and its hydrate

In this article, in a planar one-dimensional approximation, we examine the problem of injecting gaseous carbon dioxide into a porous formation saturated in its initial state with methane and its hydrate. On the basis of the equations of multiphase systems mechanics, a mathematical model of the formation of CO₂ hydrate from methane gas hydrate is constructed, acknowledging the real properties of gases. It is shown that the formation of carbon dioxide hydrate can occur in two regimes: 1) with the formation of an area saturated with methane and water, or 2) without water at all. It has been established that the main parameters determining the hydrate formation regimes are: the formation permeability, the parameters of the injected gas, and the initial parameters of the system. Here, we construct and analyze critical diagrams separating these two modes.