E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/00 (2006.01) B21D 39/20 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) E21B 7/20 (2006.01) E21B 43/10 (2006.01)
Patent
CA 2441130
(1) A steel pipe that is expanded radially in a state wherein it was inserted in a well such as an oil well, characterized in that the non-uniform wall thickness ratio E0 (%) before expanding satisfies the following expression ~. E0 .ltorsim. 30 /(1 + 0.018 .alpha.) .multidot. ~ Wherein .alpha. is the pipe expansion ratio (%) calculated by the following expression ~. .alpha. = [(inner diameter of the pipe after expanding - inner diameter of the pipe before expanding)/inner diameter of the pipe before expanding] × 100 .multidot.~ (2) A steel pipe that should be expanded radially in a state wherein it is inserted in a well, such as an oil well, characterized in that the eccentric non- uniform wall thickness ratio is 10 % or less. When the embedding-expanding method is performed with use of the steel pipe of (1) or (2), lowering of collapse strength of the expanded steel pipe is prevented and bending thereof can be decreased.
L'invention porte sur un tubage d'acier se déployant dans un état où il puisse être introduit dans un puits, par exemple de pétrole, et dont l'excentricité EO (%) avant dilatation satisfait à la formule (1): EO (%)</= 30 / (1 + 0,018 alpha , dans laquelle: alpha est le coefficient (%) de dilatation du tubage donné par la formule (2): alpha = [(diamètre intérieur du tubage après dilatation - diamètre intérieur du tubage avant dilatation x 100. L'invention porte également sur un tubage d'acier se déployant dans un état où il puisse être introduit dans un puits et dont l'excentricité de l'épaisseur de la paroi ne dépasse pas 10%. Un tel tubage après enfouissement et dilatation selon le procédé conserve sa résistance à l'écrasement et présente un fléchissement réduit.
Amaya Hisashi
Arai Yuji
Kondo Kunio
Yamane Akihito
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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