The invention relates to a method for gas extraction through a
bedding directional long
drill hole traversing working face in a broken and soft
coal seam. According to the method, through an air screwmotor
directional drilling technology, the
bedding gas extraction long
drill hole is constructed in a tunneled roadway on one side of the working face of the
coal seam, and the
drill holes penetratesthrough a to-be-tunneled roadway on the other side of the working face to the position, within the control range of 15-20 m, of the outer side of the roadway; and after the
drill hole is completed, adrill tool is lifted up, an open-close type guiding
drill bit and a drill rod with a large through hole are put down, then a hole protection screen
pipe is put down through the center of the drill rod, then the drill rod is lifted up, the screen
pipe stays in the hole, and then a gas extraction pipeline is connected for gas pre-extraction. An air screw motor
directional drilling method is adoptedin the gas treatment technology so that the drilling depth of
bedding extraction of the broken and soft
coal seam and the coal seam drilling-encounter rate can be greatly increased, invalid footagesare reduced in quantity, meanwhile the
drill hole coverage range is ensured, the purpose of gas pre-extraction outburst
elimination of the stope face and the to-be-tunneled roadway is achieved, and safe tunneling of the coal seam roadway and safe extraction of coal extraction work face are ensured.