E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/10 (2006.01) E21B 29/10 (2006.01) F16L 9/12 (2006.01) F16L 11/12 (2006.01) F16L 55/165 (2006.01)
Patent
CA 2328199
A foldable tube has a wall with at least three elongate relatively flexible areas which form hinges that define wall segments which can be folded inwardly to bring the tube into a contracted shape and which can be folded outwardly to bring the tube in a substantially cylindrical, elliptical or polygonal shape whereby the relatively rigid wall segments of the tube between the hinges inhibit refolding of the tube into its contracted shape after expansion thereof. Preferably the tube is used as a liner within a tubular cavity, such as a well or a pipeline.
Tube pliable dont la paroi présente au moins trois zones allongées relativement souples constituant des charnières définissant des segments de paroi qu'on peut replier vers l'intérieur, de manière à faire prendre au tube une forme contractée, et vers l'extérieur, de manière à lui faire prendre une forme pratiquement cylindrique, elliptique ou polygonale, les segments de paroi relativement rigides du tube empêchant ce dernier de reprendre sa forme contractée après sa dilatation. On utilise, de préférence, ce tube sous forme de doublure à l'intérieur d'une cavité tubulaire, telle qu'un puits ou une canalisation.
Shell Canada Limited
Smart & Biggar
LandOfFree
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