Operate a rotating drilling groove, use percussive drill bit, establish a large-scale impact force within a specified time range; Operate method to control pressure and air flow through the sand tower.

摘要

Method of operating a Drill string Rotary Percussion drill bit,Which provides an impact Force magnitude within a defined Range, method of operation, which controls the pressure and Flow of Air through the string and method of operation Gift;Head of a load is added to the drill string.