High speed spiral composite drilling technology is a method of improving the problems encountered during the drilling process of broken soft composite coal bodies.By studying key parameters such as feed speed,compressed air volume,and drilling tool speed,suitable drilling parameters were determined.In addition,three drilling tool combinations with high strength,good stiffness,and good drilling straightness were designed,namely φ1 10/63.5 mm,φ95/60.3 mm and φ88/50 mm.By optimizing the material of the drill rod and selecting the triangular bevel PDC drill bit,the effectiveness of the spiral drilling tool was improved.At the same time,it was matched with the ZDY6000LR high-power drilling rig,enhancing the ability and rate of deep hole drilling.In the on-site industrial test of No.4318 working face in a certain coal mine,it was shown that the high speed spiral composite drilling technology and the matching drilling equipment and drilling tool combination can effectively solve the problems of difficult slag discharge and top drilling of spray holes during the construction process.The drilling completion rate has been significantly improved,with drilling completion rates excee-ding 70％for drilling over 100 m.
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