Adjustable bent sub

Details Adjustable bent sub Adjustable bent sub

1990-12-31

1992-06-30

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...

175320, 166237, 285 93, 285184, E21B 708

Patent

active

051254638

ABSTRACT:
An adjustable bent sub for a down hole drill is disclosed consisting of a hollow housing and a hollow mandrel shaped to fit within the housing. A jam nut is positioned on the end of the mandrel to retain it within the housing by abutting a shoulder provided on the inner surface of the housing. A 1 degree off-normal face is machined on the shoulder and on the abutting face of the jam nut. By positioning the mandrel/jam nut assembly at different angular positions with respect to the housing, a linear deviation of 0 to 2 degrees is possible through the length of the sub.

REFERENCES:
patent: 4077657 (1978-03-01), Trzeciak
patent: 4303135 (1981-12-01), Benoit
patent: 4745982 (1988-05-01), Wenzel
patent: 4813497 (1989-03-01), Wenzel
patent: 4817740 (1989-04-01), Beimgraben
patent: 5029654 (1991-07-01), Wilson et al.

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