Application of Screen Pipe Protected Borehole Process in Soft and High Outburst Coal Seam

Due to the difficult drilling of the gas drainage borehole and borehole wall extremely unstable in soft and high outburst coal seam, the quality of drilling construction and the pre-drainage effect were affected by collapse borehole. Through the application of screen pipe protected borehole process of gas drainage along seam in Shoushan First Coal Mine, not only the technical problems of the screen pipes not down to the borehole depth,the difficult drilling of the gas drainage borehole and the collapse borehole were solved, but also improving the concentration of gas drainage borehole, at the same time the insufficiency problems in the process were also analyzed, for providing the technical experience of application of screen pipe protected borehole process of gas drainage technology in soft and high outburst coal seam.