Drill steering apparatus

Details Drill steering apparatus Drill steering apparatus

1980-06-12

1983-07-26

Leppink, James A.

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

Axially spaced opposed bore wall engaging guides

166319, E21B 708

Patent

active

043948812

ABSTRACT:
Well bore drilling apparatus has a steering tool operable to stabilize the drill string above the drill bit and to selectively cause a lateral force to be applied to the bit to deflect the drill in a selected direction. The apparatus includes master sensors, in the form of pistons, which sense the lateral force of the drill stem on the low side of the hole and apply fluid pressure to selected slave pistons which are circumferentially spaced above the drill bit to apply lateral thrust in the selected direction. The slave pistons are selected by valves in the apparatus which are opened or closed, as desired, either before running the tool into the well bore or by a wireline manipulator tool while the tool remains in the well bore.

REFERENCES:
patent: 3092188 (1963-06-01), Farris et al.
patent: 3424256 (1969-01-01), Jeter et al.
patent: 3593810 (1971-07-01), Fields
patent: 3595326 (1971-07-01), Claycomb

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