Thrust actuated drill guidance device

Details Thrust actuated drill guidance device Thrust actuated drill guidance device

1980-02-04

1981-12-15

Leppink, James A.

Boring or penetrating the earth

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

175107, 175325, 175 76, E21B 708

Patent

active

043054749

ABSTRACT:
A device for providing directional control to a borehole being drilled. The device is used with a drilling system including a drill string, a downhole motor and a bit rotated by the downhole motor. The device exerts a deflecting force perpendicular to the axis of the drill string when a lower than normal thrust is imposed on the drill string, and exerts an opposite perpendicular force when a higher than normal thrust is imposed on the drill string. When normal thrust is being used, the device does not cause deflection in either direction.

REFERENCES:
patent: 3098534 (1963-07-01), Carr et al.
patent: 3129776 (1964-04-01), Mann
patent: 3853186 (1974-12-01), Dahl et al.
patent: 3888319 (1975-06-01), Bourne, Jr.

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