Expandable wellbore assembly

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/10 (2006.01) E21B 17/10 (2006.01) E21B 23/01 (2006.01) E21B 33/128 (2006.01)

Patent

CA 2540481

An assembly for use in a wellbore formed in an earth formation, comprising an expandable tubular element and an outer structure having first and second portions arranged at a distance from each other, said portions being to the tubular element in a manner that said distance changes as a result of radial expansion of the tubular element, the outer strucure further having a third portion arranged to move radially outward upon said change in distance between the first and second portions, wherein said radially outward movement of the third portion is larger than radially outward movement of the tubular element as a result of radial expansion of the tubular element.

L'invention concerne un ensemble s'utilisant dans un puits de forage formé dans une formation terrestre, qui comprend un élément tubulaire expansible et une structure extérieure comportant une première et une deuxième partie espacées selon une certaine distance. Ces parties sont retenues par rapport à l'élément tubulaire de sorte que l'expansion radiale de l'élément tubulaire modifie ladite distance. La structure extérieure comporte en outre une troisième partie, placée de manière à être déplacée radialement lorsque la distance entre les première et deuxième parties est modifiée. Le déplacement radial vers l'extérieur de la troisième partie est supérieur au déplacement radial vers l'extérieur de l'élément tubulaire consécutif à l'expansion radiale de ce dernier.

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