The coal seams in Zhao Zhuang Mine of Jincheng Anthracite Mining Group (now Jineng Holding Coal Industry Company) have complex geological conditions with well - developed faults. The firmness coefficient of the coal seams ranges from 0.3 to 0.5. Usually, the maximum drilling depth of ordinary drilling rigs does not exceed 200m. However, by using the ZYL17000D drilling rig, which is equipped with the YSX16 wireless electromagnetic wave measurement - while - drilling device and triangular spiral groove drill pipes for directional drilling construction, the drilling depth has successfully exceeded 300m.At present, integrated drilling and flushing construction is being carried out in the cutting eye of the 1313 working face and the 13132 belt conveyor roadway. The triangular spiral groove drill pipes are used in combination with a water jet for backward flushing. A special hydraulic flushing pump truck is used, with a pressure reaching 20MPa for flushing and cavity - forming. After the flushing is completed, low - pressure and high - flow water is used for hole washing. The coal output per meter is more than 0.5m³. The gas extraction concentration of the boreholes is 68.9%, and the pure gas extraction volume is 747m³/d. Among them, the concentration of Hole No. 5 after sealing reaches 90%, and the instantaneous pure gas extraction volume reaches 2900m³/d.