Optimization of Drilling Parameters in Influence Area of Gas–Solid Interaction during Parallel Drilling Hole

Previous studies have established that the selection of gas extraction borehole parameters is crucial for effectiveness extraction. To more accurately determine reasonable radius boreholes in coal seam, this study was based on actual occurrence conditions body. A coal-seam gas-seepage model, considering dynamic changes permeability under gas–solid coupling conditions, constructed. It combined with FLAC3D numerical simulations to develop a model closer field’s natural needs. The revealed influence diameter and spacing extraction, obtained effect optimized data simulation experiments. Multiple sets experimental results indicated optimal are φ = 113 mm 5 m. Applying these on-site tests at 14,303 working faces particular mine significantly improved efficiency, 29.7% increase concentration. This verified accuracy provides scientific basis cost reduction efficiency enhancement wellbore mining.