Method for reducing diameter reduction near ends of expanded...

E - Fixed Constructions – 21 – B

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E21B 43/10 (2006.01)

Patent

CA 2528974

A variety of approaches to reducing or eliminating "end effect" or the tendency of tubular ends to reduce in diameter after expansion are disclosed. Some involve pre-bending the ends outwardly while others involve removing material internally or/and externally near the ends. Yet other approaches feature weakening the ends in other ways including penetration of the tubular material using openings of various shapes including slots or/and holes where the openings are between the tube ends or where they can extend on one or both ends all the way to the end of the tubular. Inserts that are softer than the tube material can be placed near the ends. If there is an end effect, then the protruding material can be pushed out of the way or broken off.

La présente invention concerne diverses technique permettant de réduire ou d'éliminer l'effet d'extrémité où la tendance des extrémités tubulaires à rétrécir leur diamètre après dilatation. Certaines de ces techniques consistent à incurver préalablement les extrémités vers l'extérieur tandis que d'autres techniques consistent à retirer du matériau de manière interne et/ou externe près des extrémités. D'autres techniques encore consistent à affaiblir les extrémités par d'autres moyens comprenant la pénétration du matériau tubulaire au moyen d'ouvertures de diverses formes notamment des fentes et/ou des trous, ces ouvertures étant situées entre les extrémités du tuyau ou là où elles peuvent s'étendre sur une extrémité ou sur les deux extrémités sur toute la longueur vers l'extrémité de l'élément tubulaire. Des inserts plus mous que le matériau du tuyau peuvent être placés près des extrémités. S'il existe un effet d'extrémité, le matériau qui fait saillie peut-être repoussé en dehors du passage ou cassé.

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