Determining the Maximum Depth Method for Complex Formation Pneumatic DTH Drilling with the Casing

In geotechnical drilling engineering,pneumatic DTH drilling technology with the casing are to address complex stratigraphic drilling questions is more effective method,this article discusses the classification of complex formation and the casing wall friction problem;Described pneumatic DTH drilling pipe with the working principle;analyzed the casing force process of pneumatic DTH,according to wave dynamics,presented theoretical calculations to determine the biggest pipe casing depth follow-up method in pneumatic DTH drilling.