PERCUSSION ASSISTED ROTARY EARTH BIT AND METHOD OF OPERATING THE SAME
摘要
A method of boring through a formation includes providing a drilling machine and drill string and operatively coupling an earth bit to the drilling machine through the drill string. An air flow is provided through the drill string at an air pressure less than about one-hundred pounds per square inch (100 psi) and an overstrike force is applied to the earth bit, wherein the overstrike force is less than about five foot-pounds per square inch (5 ft-lb/in2).
申请公布号
WO2010017367(A2)
申请公布日期
2010.02.11
申请号
WO2009US52968
申请日期
2009.08.06
申请人
ATLAS COPCO SECOROC LLC;RAINEY, ALLAN, W.;LANGFORD, JAMES, W.