Improved underreamer and method of use

Details Improved underreamer and method of use Improved underreamer and method of use

E - Fixed Constructions

21

B

E21B 10/32 (2006.01) E21B 7/28 (2006.01)

Patent

CA 2586045

The present invention discloses a collapsible drilling assembly having field- replaceable cutter or stabilizer blades (214) and method of using and installing new stabilizer blades while at a job location. The drilling assembly is deployed upon a distal end of a drillstring, expanded to a gauge size, and used as an underreamer or alternatively a stabilizer. The drilling assembly operates between retracted and extended positions through the increase in pressure of drilling fluid flowing therethrough.

La présente invention concerne un ensemble de forage pliable ayant des lames de coupe ou de lames de stabilisateur (214) remplaçables sur site et leur procédé d'utilisation ainsi que l'installation de nouvelles lames de stabilisateur une fois sur un lieu de travail. L'ensemble de forage est déployé au-dessus d'une extrémité distale d'un train de forage étendu à une dimension de calibre, et utilisé comme élargisseur ou, en variante, comme stabilisateur. L'ensemble de forage fonctionne entre des positions rétractées et déployées par augmentation de la pression du fluide de forage s'écoulant à travers.

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