Drill head steering

Details Drill head steering Drill head steering

2007-03-27

2007-03-27

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

Processes

Boring curved or redirected bores

C175S067000, C175S073000

Reexamination Certificate

active

10531711

ABSTRACT:
A method of steering a fluid drilling head in an underground borehole drilling situation is provided by rotating the flexible hose through which high pressure is provided to the drilling head and providing a biasing force on the drilling head. The hose can be rotated from a remote surface mounted situation by rotating the entire surface rig (13) in a horizontal plane about a turntable (24) causing the vertically orientated portion of the hose (11) to rotate about its longitudinal axis. The biasing force can be provided in a number of different ways but typically results from the use of an asymmetrical gauging ring on the fluid drilling head.

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