Application of Horizontal 1 000 m Directional Drilling Rig to Mine Gas Drainage

According to the small capacity of the present underground mine conventional drilling rig, the short gas drainage period and the serious disproportions p henomenon of the mine excavation, drainage and mining percentages, the VLD-1000 and ZDY6000LD mode underground mine 1 000 m directional drilling rigs were ap plied base on the excavation of the coal mining face, the mining connection and the design of the gas deposit features in the target zone, and the layout of the drilling ri ng site.The paper in detail introduced the drilling operation process, construction condition and the gas drainage effect.In comparison between the 1 000 m directional d rlling and the traditional and conventional drilling technique, the single drilling borehole space of the directional borehole, the percentage of the borehole and coal bore hole, the gas drainage concentration were 6.0, 2.3 and 2.0 times of the insitu seam borehole individually.The directional drilling borehole would have high gas drainage rate, a longer pre-drainage period, high suitable drilling construction, large covered scope of the borehole and other features.