STUDY OF THE GAS COMPOSITION IN NATURAL GAS HYDRATES AND THEIR STABILITY IN POROUS MEDIA

The relevance of the investigation is related to the study of the storage possibility of natural gas in a hydrated state in subpermafrost aquifers in the territory of Yakutia. This paper presents the results of a study of the gas composition in natural gas hydrates obtained in moist porous media and, for comparison, considers the processes of hydrate formation in a volume of water. Bi- and polydisperse quartz sands were used as a model of porous medium. Moisture content was set with distilled water and was 15%. Hydrates were obtained in high-pressure chambers at a temperature of +5°C and a pressure of 8 MPa. The fat content coefficients of gases in hydrates and their kinetic stability at atmospheric pressure and temperature +5°C were determined. It has been established that the coefficients of fat content of gases in the resulting hydrates are almost the same and the gases are classified as fatty. However, the stability of hydrates obtained in bulk water is three times less than that of hydrates in a porous medium, which indicates the stability of the latter.