中心通缆钻杆及其在煤矿井下定向钻进中的应用

针对煤矿井下定向钻技术对钻杆的随钻测量通讯和强度要求，钻杆采用中心通缆方式，可实时传输钻孔随钻测量信号。采用高强度管材、特种螺纹丝扣结构、摩擦焊技术，可提高钻杆抗拉、压、弯、扭强度。并根据现场使用中存在的问题给出了解决方法。大佛寺煤矿随钻测量应用实例说明中心通缆钻杆满足最大孔深1200 m的随钻测量通讯和钻杆强度要求，朱仙庄梳状孔应用实例说明中心通缆钻杆满足最小弯曲半径54 m定向孔施工，哈沙图煤矿定向钻孔应用实例说明中心通缆钻杆满足急倾斜58?煤层定向孔施工。

Application of the Center Cable Pipe for Directional Drilling in Coal Mine

According to the requirements of the strength and MWD communication to the drill pipe for the directional drilling technology, center cable drill pipe is used to realize real-time MWD signal transmission; and the high strength pipe, special screw thread structure, friction welding technology are adopted to improve the tensile, compression, bending and torsional strength of pipe. The necessary solutions are introduced based on the existing problems in field operation. MWD examples in Dafosi mine, comb hole examples in Zhuxianzhuang mine and directional drilling examples in Hashatu mine respectively prove that the center cable drill pipe can meet the requirements of measuring communication and strength with the maximum hole depth of 1200m, the directional drilling with minimum bending radius of 54m and directional drilling in coal seam with inclined angle of 58.