Oriented drilling tool

Details Oriented drilling tool Oriented drilling tool

1973-07-16

1978-02-28

Brown, David H.

Boring or penetrating the earth

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

175 61, E21B 706

Patent

active

040760847

ABSTRACT:
This is a drilling tool which can be manipulated from the surface to one position to drill a directionally oriented hole or to a second position to drill a straight hole. A special tool is inserted in the drill string near the bit. It includes a hollow torque member, which is connected into the drill string. Surrounding the torque member are two eccentrically bored sleeves, one within the other. The two sleeves are rotatable with respect to each other and with respect to the torque member. When the cam sleeves are opposed, the torque member is aligned along the borehole axis. When the cam sleeves are oriented in the same direction, their eccentricity is added and the torque tube is thrown off center to cause the bit to drill in a prescribed direction. Means are provided so that the position of the sleeves can be changed from the surface. Manipulation is by mud circulation and pipe movement.

REFERENCES:
patent: 2316409 (1943-04-01), Downing
patent: 2891769 (1959-06-01), Page et al.
patent: 2919897 (1960-01-01), Sims
patent: 3352370 (1967-11-01), Livingston
patent: 3572450 (1971-03-01), Thompson

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