Downhole stabilisers

Details Downhole stabilisers Downhole stabilisers

E - Fixed Constructions

21

B

255/28, 255/6

E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 17/07 (2006.01) E21B 17/10 (2006.01)

Patent

CA 1329931

ABSTRACT "Downhole Stabilisers" There is described a directional downhole stabiliser for use in a drill string. The stabiliser has an effective diameter which is selectively variable between a minimum diameter and a maximum diameter depending on the load on the drill string. The effective diameter is determined by radially movable spacers which are caused to move radially on relative movement of a mandrel which telescopes within the stabiliser casing and which has cam surfaces which engage the radial spacers. The telescopic movement of the mandrel within the casing is controlled via a mechanical detent arrangement which is actuated by the compressive force on the stabiliser.

551851

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