Low stress traction system

Details Low stress traction system Low stress traction system

E - Fixed Constructions

21

B

E21B 23/01 (2006.01) E21B 33/129 (2006.01)

Patent

CA 2699877

A technique enables anchoring of a tool in a wellbore. The technique provides traction against a well component without creating high stress concentrations that weaken the well component. An anchoring device comprises anchoring members that are selectively movable to an expanded configuration for anchoring the tool. The anchoring members have traction surfaces able to selectively engage a smooth anchoring surface of the well component at any desired location along the well component. Each traction surface is formed to facilitate traction while minimizing stress concentration.

Selon l'invention, une technique permet l'ancrage d'un outil dans un forage de puits. La technique procure une traction contre un composant de puits sans créer de concentrations élevées de contraintes qui affaibliraient le composant de puits. Un dispositif d'ancrage comprend des éléments d'ancrage qui peuvent se déplacer sélectivement jusqu'à une configuration dilatée pour ancrer l'outil. Les éléments d'ancrage possèdent des surfaces de traction capables de se mettre en prise sélectivement avec une surface d'ancrage lisse du composant de puits à tout endroit souhaité le long du composant de puits. Chaque surface de traction est formée pour faciliter la traction tout en minimisant la concentration des contraintes.

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