Throttling effect assessment on gas-well near-wellbore temperature

This article investigates non-isothermal gas filtration in low-temperature reservoirs. It is shown that accounting for the hydraulic resistance of the porous medium in the energy equation leads to an expression for the entropy generation rate, a key characteristic of the irreversibility of reservoir development processes. The peculiarities of the Joule–Thomson effect in porous media are studied. It is considered that isoenthalpic processes affect the porous medium saturated with gas as an isolated system as a whole, rather than just the gas phase alone. A dependence of the Joule–Thomson coefficient on porosity and rock heat capacity is derived. The obtained pattern indicates that the Joule–Thomson coefficient decreases more than sixfold at a porosity of 0.24, leading to a less significant temperature drop under the same pressure drawdown. The calculations allow determining the conditions for hydrate-free well operation.