Investigation of the flow rate influence on the hydrate formation in the bottom-hole zone, bore and well pipelines

The dual problem of recovery well's thermal interaction with permafrost rocks is considered, which reduces to solving differential equations describing the non-isothermal gas flow in the well and equations of heat distribution in rocks with the certain conjugation conditions. In the case of well pipelines, this task is not conjugate, because hydrate plug can form in a fairly short time. Whereas, in the quasistationary mathematical model of gas hydrate formation in wells and well pipelines, the dependence of the heat transfer coefficient on the gas to the inner wall of the pipe on the passage area that changes with time is taken into account. The dynamics of changes in the temperature and pressure of the gas, as well as the pipe cross-section at various modes of gas extraction in the absence of a hydrate inhibitor, is determined. An analysis of the results showed that the hydrate formation in wells, even at low reservoir temperatures and a thick layer of permafrost, takes a sufficiently long period of time to quickly prevent emergencies in gas production systems. Next, the problem of gas extraction through a single well located in the center of a circular reservoir, in the formulation of which energy transfer due to thermal conductivity is considered negligible compared to convective transfer, is considered. It was found that during selection, the gas temperature will be everywhere below the equilibrium temperature of hydrate formation. Thus, the bottom-hole zone of the wells should be treated with hydrate inhibitors.