针对现有定向钻进技术装备不能满足超长工作面瓦斯大区域治理对井下顺煤层定向钻孔深度要求的问题，提出利用泥浆脉冲无线随钻测量系统替代有线随钻测量系统进行钻进参数测量，避免了有线随钻测量系统信号传输受通缆钻杆影响的问题；基于近水平钻孔回转钻进的“岩屑楔”理论，通过优化螺杆钻具结构及调整钻进工艺参数实现复合钻进状态下钻孔增、降、稳倾角调节，进一步提高了复合钻进进尺比例，使钻进系统压力明显降低。结合保德煤矿生产需要施工完成主孔深度2 570 m、孔径120 mm的顺煤层超长定向钻孔，钻孔平均日进尺达到200 m以上，通过对该超深孔施工关键装备适应性分析可知：钻进装备稳定可靠，无线随钻测量系统信号在超深钻孔中传输稳定，复合钻进倾角控制效果良好，系统压力参数下降明显，说明该套技术装备能满足煤矿井下2 500 m顺煤层超深定向钻孔的施工要求。研究成果可为顺煤层超深定向钻孔施工和超长工作面瓦斯超前治理提供重要借鉴。

In view of the problem that the existing directional drilling technology and equipment can not meet the requirements for the depth of in-seam directional borehole in the large area of gas control in the ultra long working face. It is proposed to use the mud pulse wireless MWD system instead of the wired MWD system to measure the drilling parameters, so as to avoid the problem that the signal transmission of the wired MWD system is affected by the cable drill pipe.Based on the theory of “cuttings wedge” in rotary drilling of near horizontal borehole, the inclination of increase, decrease and balance borehole angle under the condition of compound drilling is adjusted through optimizing the structure of DHM and adjusting the drilling parameters,which further improves the proportion of compound drilling footage and makes the drilling system pressure significantly lower.In combination with the production needs of Baode Coal Mine, the in-seam ultra-deep directional borehole with the depth of 2 570 m and the diameter of 120 mm is completed, and the average daily drilling footage is more than 200 m.According to the adaptability analysis of the key equipment of the ultra-deep borehole, it can be seen that the drilling equipment is stable and reliable, the signal transmission of wireless MWD system is stable in the ultra deep drilling, the angle control effect under the condition of compound drilling is good, and the system pressure parameter drops obviously, which shows that the technical equipment can meet the construction requirements of the ultra deep directional drilling of 2 500 m coal seam under the full coal mine.It provides an important reference for the construction of ultra deep directional drilling along the coal seam and the advanced gas control in the ultra long working face.The drilling process shows that the drilling equipment is stable and reliable, the signal of wireless MWD system is stable in the ultra-deep borehole, the angle of control inclination of compound drilling is effective, and the pressure parameters of the drilling system is obviously reduced. It shows that the technology and equipment can meet the construction requirements of the in-seam ultra-deep directional borehole beyond 2 500 m underground coal mine.The research can provide an important reference for the construction of in-seam ultra-deep directional borehole and the comprehensive advanced control of gas in the area of ultra-long working face.