Abstract:
As part of the task of injecting gas through a single well into a horizontal aquifer, the possibility of underground storage (conservation) of carbon dioxide in a hydrate state, i.e. in a solid phase, which is formed under certain thermobaric conditions, is being studied. The computational experiment was carried out on the basis of a mathematical model of non-isothermal filtration of gas and water, derived on the basis of the fundamental laws of conservation of mass and energy. In this model, the main physical features of the process are most fully taken into account: the real properties of the gas, the throttling effect, the joint movement of water and gas in a homogeneous porous medium, mass transfer between gas and water with hydrate. The computational experiment evaluates the dynamics of the distribution of hydrate saturation, water saturation, pressure and temperature in the selected reservoir, which is characterized by porosity, permeability and initial values of pressure, temperature and water saturation. To conduct computational experiments on the formation of gas hydrate, the results of laboratory experiments were used to determine the equilibrium conditions of carbon dioxide hydrates formation in pore space and aqueous solutions simulating stratum waters of subpermafrost horizons. The influence of the equilibrium conditions of hydrate formation on the main indicator of the process efficiency — the hydrate saturation of the underground gas storage facility — is shown.
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