Application of ZDY4000LD(A) Directional Drilling Equipment for Medium-deep Borehole in Chengzhuang Coal Mine

According to the problems existed in the construction of the integrated directional drilling equipment which is used in the middle and small coal mine, combining with the technical problems of shallow drilling depth and low extraction rate of the gas drainage drilling in this kind of coal mine, the ZDY4000LD （Ａ） medium-deep borehole split directional drilling equipment was provided to the directional gas drainage drilling. A drilling test was carried out in Chengzhuang Coal Mine of Jincheng Coal Group. In two experimental areas, six directional gas extraction drilling boreholes were completed. The depth of the single drilling borehole was 450 m, the total number of drilling borehole branches was 45, the total footage of single drilling borehole was 3 639 m, and the total footage of all drilling borehole was 14 280 m. The outstanding feature of ZDY4000LD （Ａ） medium-deep borehole directional drilling equipment was verified by the drilling test, such as reliable performance, moderate ability, strong adaptability and flexible relocation, which could improve the construction efficiency of directional drilling in medium-deep boreholes.