Adjustable bent sub

Details Adjustable bent sub Adjustable bent sub

E - Fixed Constructions

21

B

255/6

E21B 7/06 (2006.01)

Patent

CA 2019898

ABSTRACT OF THE DISCLOSURE An adjustable bent sub for use in earth drilling. The bent sub has a tubular mandrel with an offset axis which is telescopically received in a tubular housing with an offset axis. By rotation of the mandrel in relation to the housing an adjustment may be made in a bend created by the cumulative effect of the offset axis of the mandrel and the offset axis of the housing. A longitudinal stop limits longitudinal displacement of the mandrel within the housing. The mandrel is longitudinally slidable within the housing between a first position wherein further displacement toward the second end of the housing is limited by the longitudinal stop and a second position wherein the mandrel is displaced toward the first end of the housing. A rotational stop prevents relative rotation between the mandrel and the housing when the mandrel is in the first position and allows such relative rotation when the mandrel is in the second position. rotator acts between the mandrel and the housing, reacting to longitudinal displacement between the mandrel and the housing to cause a predetermined amount of relative rotation between the mandrel and the housing when the mandrel is displaced from the first position to the second position and returned to the first position. A split ring locks the mandrel in the first position.

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