Adjustable bent sub

Details Adjustable bent sub Adjustable bent sub

1991-06-24

1992-12-08

Melius, Terry Lee

Boring or penetrating the earth

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

Sectional guide or shaft having means to lock sections in...

175256, 285397, E21B 708

Patent

active

051689430

ABSTRACT:
The sub, usable as a length element of a drill string which may include a drilling motor body, comprises three generally tubular members. Two members, each having means to attach to a continuing drill string, have threaded boxes positioned in opposition. A third member is a double ended threaded, shoulderless, pin threadedly extending into the boxes with box faces in contact when the sub is assembled. One box, and the mating pin end, have threads coarser than the finer threads in the other box and on it's mating pin end. Axial position adjustment of the pin causes the abutting box faces to change rotational relationship, thus changing the rotational relationship of axially spaced drill string elements separated by the sub. If the sub is to be used to deflect the drill string centerline, the double ended pin and the threaded boxes have a centerline tilted a small angle from the centerline of the first two members. In one configuration the assembly has, preferably, both end centerlines on one line. Manipulation as previously described rotates one end of the sub relative to the other end to cause the overall centerline of the assembly to be deflected.

REFERENCES:
patent: 2259191 (1941-10-01), Allen
patent: 2699182 (1955-01-01), Baldridge, Jr.
patent: 4813497 (1989-03-01), Wenzel
patent: 5029654 (1991-07-01), Wilson et al.
patent: 5094305 (1992-03-01), Wenzel

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