Technology of Gas Drainage with Large Diameter Screen Pipe of High-level Directional Long Borehole in Huainan Mining Area
In order to solve the problem that the gas drainage channel is easy to block and affect the gas drainage effect in the management of the gas in the goaf of the high-level directional long borehole,the technology of the lower screen pipe in the full-hole section of the high-level directional long borehole is proposed.Research on the technology of screen pipe with different diameters under the full-hole section of the borehole.Field test in Pansan mine.The test results show that the large-diameter φ73 mm screen pipe under the full-hole section can effectively improve the gas drainage effect of high-leveldirectional long boreholes and not only improve the drilling hole gas drainage stability and effective drainage hole section ratio,and the average gas drainage concentration of boreholes has been increased from 19%to 45%,formed a gas drainage technology suitable for high-level directional long boreholes and large diameter screen pipe in Huainan mining area,improve the efficiency of gas control in the goaf of Huainan mining area.
high-level directional drillinggas drainagescreen pipedrainage process
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