Simulation of hydrate plug formation during joint operation of a gas-bearing reservoir and a well for the case where the equilibrium conditions of hydrate formation depend on formation water composition

A generalized mathematical model for the non-isothermal filtration of natural gas in a porous medium and a modified quasi-stationary model of gas hydrate formation (deposition) in pipelines were used to solve a conjugated problem for the case of joint operation of the "gas-bearing reservoir-well" system and predict the changes in temperature, pressure, gas moisture content, and well flow area. It is found that the presence of a thick permafrost layer accelerates hydrate formation inside the well. It is shown that when taking into account the salinity of formation waters, the duration of complete plugging of the well with hydrates increases.