Downhole tool with extendable members

Details Downhole tool with extendable members Downhole tool with extendable members

E - Fixed Constructions

21

B

E21B 10/32 (2006.01) E21B 17/10 (2006.01)

Patent

CA 2351849

A downhole tool (10) for mounting on a drill string comprises: a mandrel (16); a body (18) axially movably mounted on the mandrel; and radially extendable members, such as stabiliser blades or cutters (30), mounted in the body and being operatively associated with the mandrel such that relative axial movement of the mandrel and body induces radial movement of the members. Application of axial tension to the tool produces axial movement of the body relative to the mandrel, tending to retract the members from an extended configuration. The mandrel may be arranged to draw the members inwardly to permit positive retraction of the members from an extended configuration. Further, the body may define a channel (32) and the mandrel and the members include an arrangement (38, 39, 40, 42) for maintaining a desired orientation of the members relative to the body channel.

Un outil de fond (10) destiné à être monté sur un train de tiges comprend un mandrin (16), un corps (18) monté mobile axialement sur le mandrin et des éléments déployables radialement, tels que des lames ou des couteaux stabilisateurs (30) montés dans le corps et associés fonctionnellement au mandrin, de manière que le mouvement axial relatif du mandrin et du corps induise un mouvement radial des éléments. L'application d'une tension axiale à l'outil produit un mouvement axial du corps par rapport au mandrin, tendant à rétracter les éléments depuis leur configuration déployée. Le mandrin peut être agencé pour tirer les éléments intérieurement afin de permettre la rétraction directe des éléments à partir d'une configuration déployée. De plus, le corps peut définir un canal (32) et le mandrin ainsi que les éléments comprennent un agencement (38, 39, 40, 42) permettant de maintenir une orientation voulue des éléments par rapport au canal du corps.

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