Keyword: «quartz sand»

Equilibrium conditions of the natural gas hydrate formation in a porous medium with different salinity are determined by the method of differential thermal analysis. Bidisperse quartz sand was used as a porous medium, in which fractions with a particle size of 0,5–0,25 mm (54%) and 0,25–0,1 mm (42%) predominate. The salinity of the porous medium was set to 5% wt. sodium chloride solution, sodium bicarbonate solutions with concentrations of 0.25 and 2% wt., and for comparison, the sand was moistened with distilled water. The dependences for predicting the equilibrium conditions of the natural gas hydrates formation in a porous medium with different salinity are determined. Based on the obtained equilibrium values of temperatures and pressures, the enthalpies of the hydrate dissociation in the considered systems are calculated.