Hydraulic drilling method with penetration control
摘要
Hydraulic drilling apparatus and method in which a drill head is driven toward the formation being drilled by the force of the drilling fluid, and the rate of advancement or penetration of the drill head is controlled by entrapping a fluid in a chamber to resist advancement of the drill head and allowing a controlled amount of the entrapped fluid to pass out of the chamber through an orifice to permit the drill head to advance at a controlled rate.
申请公布号
US5255750(A)
申请公布日期
1993.10.26
申请号
US19900559316
申请日期
1990.07.30
申请人
DICKINSON, III, BEN W. O.;DICKINSON, ROBERT W.
发明人
WILKES, JR., ROBERT D.;DICKINSON, ROBERT W.;MACKEY, CHARLES S.