Method for expanding a steel tubing and well with such a tubing

Details Method for expanding a steel tubing and well with such a tubing Method for expanding a steel tubing and well with such a tubing

E - Fixed Constructions

21

B

E21B 43/10 (2006.01) B21D 39/20 (2006.01) C21D 7/12 (2006.01) E21B 17/00 (2006.01) E21B 23/04 (2006.01) E21B 29/10 (2006.01)

Patent

CA 2260191

A tubing (4) made of a formable steel grade which is subject to strain hardening without incurring any necking or ductile fracturing as a result of the expansion process is expanded by moving an expansion mandrel (5) having a non-metallic tapering outer surface through the tubing, thereby increasing the strength of the tubing while expansion forces remains low.

L'invention concerne une colonne de production (4) constituée d'une qualité d'acier ductile, qui est soumise à un écrouissage sans que le processus de dilatation n'entraîne de rétrécissement ou de rupture ductile. On dilate la colonne de production en déplaçant à l'intérieur un mandrin de dilatation (5) ayant une surface externe conique non métallique, ce qui augmente la résistance de ladite colonne sans augmenter les forces de dilatation.

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