Expander for expanding a tubular element

Details Expander for expanding a tubular element Expander for expanding a tubular element

E - Fixed Constructions

21

B

E21B 43/10 (2006.01)

Patent

CA 2454070

An expander for radially expanding a tubular element, comprising an expander body connectable to an elongate member for moving the expander in axial direction through the tubular element, the expander body having a first body portion and a second body portion axially displaced from the first body portion, wherein the first body portion has a larger outer diameter than the second body portion. A set of expander segments is arranged around the expander body, each segment being movable relative the expander body between a radially extended position in which the segment is axially aligned with the first body portion and a radially retracted position in which the segment is axially aligned with the second body portion. Actuating means is provided for moving each segment between the extended position and the retracted position. Each segment and the first body portion are provided with co-operating support profiles for preventing axial movement of the segment relative to the first body portion during expansion of the tubular element whereby the segment is in the extended position.

L'invention concerne un extenseur, pour l'extension radiale d'élément tubulaire, qui comprend un corps pouvant être relié à un élément allongé capable d'assurer le déplacement axial de l'extenseur, à travers l'élément tubulaire. Ledit corps présente une première partie, et une seconde partie à déplacement axial par rapport à la première partie, laquelle a un diamètre externe supérieur à celui de la seconde partie. Des segments extenseurs sont placés autour du corps, chacun se déplaçant par rapport au corps entre une position d'extension radiale (alignement axial avec la première partie) et une position de rétraction axiale (alignement axial avec la seconde partie). Un système actionneur permet de déplacer chaque segment entre lesdites positions. Les différents segments et la première partie comportent des profils d'appui dont l'interaction empêche tout mouvement axial d'un segment par rapport à la première partie durant l'extension de l'élément tubulaire (position de segment étendue).

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