Abstract
<jats:p>Objective. To investigate the influence of reservoir drawdown on the parameters of gas inflow to a well in an underground gas storage facility created on the basis of a depleted reservoir, with due consideration of ensuring operational efficiency and technological reliability of the gas withdrawal process under real operating conditions. Methodology. Analytical modeling of steady-state radial filtration of a compressible gas was applied based on Darcy’s law, taking into account reservoir thermobaric parameters. The differential equation governing pressure distribution was solved, and a computational analysis of well productivity was performed by varying bottomhole pressure and drawdown within a specified range, which enabled evaluation of system behavior under different operating regimes. Results. It was established that an increase in drawdown within the range of 1–5 MPa leads to a nonlinear rise in well production rate, determined by the difference between the squares of reservoir and bottomhole pressures. The calculations demonstrated an increase in production rate from 30.6 to 126.4 thousand m³/day, indicating a substantial enhancement in productivity, albeit accompanied by increased risks of instability in the near-wellbore zone. Scientific novelty. An analytical relationship between well production rate and reservoir drawdown was developed, accounting for gas compressibility and real geological and technological parameters, which allows for quantitative assessment of the impact of operational factors on productivity and determination of rational operating conditions. Practical significance. The obtained results may be used to substantiate operating regimes for wells in underground gas storage facilities and gas fields, particularly in selecting permissible drawdown values to enhance gas recovery efficiency and prevent complications in the near-wellbore formation zone.</jats:p>