SIMULATION OF HYDRATE PLUG FORMATION DURING JOINT OPERATION OF A GAS-BEARING RESERVOIR AND A WELL UNDER THE EQUILIBRIUM CONDITIONS OF HYDRATE FORMATION DEPENDING ON STRATUM WATER COMPOSITION

Abstract

A generalized mathematical model of the non-isothermal filtration of natural gas in a porous medium and a modified quasi-stationary model of gas hydrate formation (deposition) in pipelines are used to solve the conjugate problem for the joint operation of the gas reservoir–well system and predict the changes in temperature, pressure, gas moisture content, and well flow section. It is found that the presence of a thick permafrost layer accelerates hydrate formation in the well. It is shown that when the salinity of stratum water is taken into account, the time of complete plugging of the well with hydrates increases.