THE EFFECT OF THE DIAMETER OF THE GAS-BEARING FORMATION'S RESERVOIR ZONE ON WELL PRODUCTION RATE
DOI:
https://doi.org/10.31471/1993-9868-2026-2(46)-11-21Keywords:
well, gas flow rate, near-wellbore zone of the formation, expanded wellbore, permeability, production.Abstract
This study investigates how the diameter of the near-wellbore zone of a gas-bearing formation affects the flow rate of a gas well. Domestic and foreign studies on the impact of wellbore enlargement on gas flow rates were analysed. To evaluate well productivity, relationships between gas flow rate and pressure distribution in the formation were used, based on linear and non-linear gas filtration laws in a porous medium. The study was conducted using a model gas well with various formation permeability coefficients (1, 5, 10, 20, 30, 40 mD, equivalent to 10–15 m²) and wellbore radii (0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.5, 2, 3, 4 m). The research results are presented in a table and depicted as graphical dependencies of gas flow rate and pressure distribution in the formation on the studied parameters (wellbore radius and formation permeability). It was established that, regardless of formation permeability, the gas flow rate increases as the wellbore radius increases, with the rate of increase being higher for formations with greater permeability. Under a nonlinear filtration law, it is shown that the gas flow rate is lower than under a linear law due to additional pressure losses associated with inertial forces. Based on the statistical analysis of the calculated data, the optimal wellbore radius values for formations with different permeabilities were determined. It was found that the optimal near-wellbore zone radius value decreases with increasing formation permeability, ranging from 0.57 to 0.611 m under the studied conditions. The results confirm the feasibility of expanding the wellbore in the productive formation zone as an effective method of increasing the gas flow rate and improving the hydrodynamic connection between the formation and the well.
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