Boring or penetrating the earth – Processes
Patent
1998-08-05
2000-11-07
Will, Thomas B.
Boring or penetrating the earth
Processes
175 98, E21B 700
Patent
active
061422452
ABSTRACT:
An extended reach drilling (ERD) system for drilling a borehole in an underground formation is provided. The ERD system comprises a drill bit, a motor for driving the drill bit, a drill-pipe to surface, a hydraulic cylinder/piston arrangement for providing the required weight on bit, the drill-pipe being coupled to a selected one of the cylinder and the piston of the cylinder/piston arrangement such that the drill pipe may rotate relative to the selected one of the cylinder and the piston, the drill bit being coupled to the other one of the cylinder and the piston, and locking members for locking the selected one of the cylinder and the piston against the borehole wall, the locking members being operable between an engaged position and a disengaged position.
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Markovich Kristine M.
Shell Oil Company
Will Thomas B.
LandOfFree
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