Method and system for tubing a borehole in single diameter

E - Fixed Constructions – 21 – B

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Details

E21B 43/10 (2006.01) E21B 17/14 (2006.01) E21B 33/14 (2006.01) E21B 41/00 (2006.01) F16L 13/14 (2006.01) F16L 55/165 (2006.01)

Patent

CA 2430240

The invention concerns a method for tubing a borehole which consists in successively lowering an unlimited plurality of tubes having a common diameter, the next one through the preceding one, to be installed one beneath the other and sealingly connected. Thus a next tube (6) is lowered folded through the preceding tube (5) and the expansion process consists in sending fluid under pressure through the lining of the wellbore (54) towards the next tube (6) so as to re-inflate it or else the next tube (6) is a cylindrical tube having a diameter smaller than the internal diameter of the preceding tube (5) and the expansion process consists in forcing a cylindrical expansion mandrel (52) from the top (26) to the base (28) of the next tube (6) so as to increase its diameter to make it equal to the diameter of the preceding tube (5). The method can use a grouting shoe (34) and a metal-metal type of tightness (29)

Méthode pour cuveler un puits dans laquelle une pluralité non limitée de cuvelages d'un même diamètre sont descendu successivement, le suivant à travers le précédent, pour être installé l'un en dessous de l'autre et relié dune manière étanche. Ainsi un cuvelage suivant (6) est descendu replié à travers le cuvelage précédent (5) et l'expansion consiste à envoyer du fluide sous pression à travers la garniture de forage (54) vers le cuvelage suivant (6) de manière à le regonfler ou bien le cuvelage suivant (6) est un tube cylindrique ayant un diamètre inférieur au diamètre intérieur du cuvelage précédent (5) et l'expansion consiste à forcer unmandrin cylindrique d'expansion (52) de la tête (26) au pied (28) du cuvelage suivant (6) de manière à augmenter son diamètre pour le rendre égal au diamètre du cuvelage précédent (5). La méthode peut utiliser un sabot de cimentation (34) et une étanchéité de type métal-métal (29).

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