Effects of High-Velocity Flow on the Temperature Field Near the Wellbore: A Review

Non-Darcy flow at high velocity near the wellbore in a gas reservoir gives rise to an array of thermodynamic complexities. The percolation models typically construed under isothermal conditions encounter difficulties in accurately portraying this scenario, eventually leading to discrepancies in forecast indicators of gas reservoirs development. This study commences a theoretical exploration of the influence that high velocity non-Darcy effects exert on the temperature field in the near-wellbore zone of gas reservoirs, further delving into the impact of temperature variations, on reservoir physical parameters (mainly porosity and permeability). Utilizing earlier studies focused on the effect of temperature variations on physical parameters and the theory of permeability-temperature deformation, we scrutinize the temperature-sensitive mechanism underlying permeability and identify problems in the model development process. Our findings reveal that when the daily gas production (or gas velocity) falls below a given threshold. Variations in daily gas production significantly affect the temperature in the near-wellbore zone of the gas reservoir. A smaller gas supply radius magnifies the temperature variations under different rates of daily gas production. In comparison to low-pressure gas reservoirs, alterations in daily gas production in high-pressure gas reservoirs induce notable shifts in the temperature field. The ambiguity associated with the findings of the permeability-temperature sensitivity experiment is largely attributable to the disparate temperature ranges used in the experiment, resulting in different mechanisms of temperature effects on the rock matrix, pores, and fractures, and differing temperature sensitivities of permeability across reservoir rock types. In conclusion, we proffer recommendations for investigating temperature variations in the near-wellbore region of gas reservoirs, with the aim of spurring more researchers to give this issue the attention it deserves.