MODES OF SULFUR DIOXIDE HYDRATE FORMATION IN A POROUS RESERVOIR INITIALLY CONTAINING METHANE AND WATER

Abstract

A mathematical model of the injection of liquid sulfur dioxide into a porous reservoir, initially saturated with methane and water, is presented. Based on numerical solutions, the pressure and temperature distributions of the reservoir at various points in time are constructed. It is shown that at low injection pressures, the formation of sulfur dioxide hydrate occurs in the regime with the formation of an area containing methane and its hydrate, and high values - without the formation of the latter. The influence of the initial reservoir temperature and the temperature of injected sulfur dioxide on the formation modes of SO2 hydrate is studied. It is shown that the formation of SO2 hydrate occurs in the regime without the formation of an area saturated with methane and its hydrate, both at high initial temperatures of the system and at high temperatures of liquid sulfur dioxide injected into the reservoir. The dependence of the critical injection temperature, above which a regime without the formation of an area containing methane and its gas hydrate, on the injection pressure SO2, is built. It is established that the regime with the formation of an area saturated with methane and its gas hydrate is typical for the case of low values of injection temperature and pressure.