Downhole adjustable bent sub

Details Downhole adjustable bent sub Downhole adjustable bent sub

1989-01-17

1989-12-05

Novosad, Stephen J.

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...

166237, 175 75, 175322, 175325, E21B 708, E21B 710

Patent

active

048846430

ABSTRACT:
A downhole adjustable bent sub is provided for use in a drilling process in which a drill bit is subjected to a drilling force. The bent sub has a tubular housing and a tubular mandrel. The tubular housing has a bend along its length to define an upper part and a lower part, the respective longitudinal axes of which intersect at an angle. The tubular mandrel also has a bend along its length to define a first part and a second part, the respective longitudinal axis of which intersect at an angle. The first part of the mandrel slidably engages the interior of the lower part of the tubular housing. a longitudinal stop prevents the mandrel from being slid out of the housing. Longitudinal biasing means urge the mandrel toward the longitudinal stop to a first position. A rotational stop prevents relative rotation between the mandrel and the housing when the mandrel is in the first position. The rotational stop allows relative rotation between the mandrel and the housing when the mandrel is slid into the housing to a second position away from the longitudinal stop. A rotator acts between the mandrel and the housing. The rotator rotates the mandrel, relative to the housing, a predetermined amount when the mandrel is slid from the first position to the second position and returned to the first position.

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