Abstract
The paper presents the results of investigation of the natural gas hydrates formation and decomposition in quartz sand in the presence of fresh water, sodium bicarbonate (0,25 and 2 mass%) and chloride (5 mass%) solutions. The selected solutions are models of stratum water of subpermafrost aquifers of the Vilyui syneclise. The study of the porous medium and salinity influence on the hydrate formation was carried out by differential thermal analysis at initial gas pressures from 4 to 7 MPa. Equilibrium conditions and kinetic parameters of the hydrate formation were determined. The kinetic parameters of the hydrate formation in porous media, depending on salinityand at each value of the initial pressure decrease in the following sequence: 0,25 mass% NaHCO3 H2O > 2 mass% NaHCO3 > 5 mass% NaCl. The stability of hydrates obtained in porous media with different salinity has been studied. It has been established that the hydrates stability in porous media decreases with an increase of the solution concentration.
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