Washpipe stabilisation

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 31/00 (2006.01) E21B 17/10 (2006.01) E21B 17/22 (2006.01) E21B 29/00 (2006.01) E21B 31/03 (2006.01) E21B 37/02 (2006.01)

Patent

CA 2253753

The invention relates to washpipe assemblies for use in well bores and provides a washpipe assembly (2) comprising a washover shoe (10) attached to a washpipe (18), wherein a washpipe stabiliser (22) is provided on the washpipe (18) so that, when in use, deflection of the washover shoe (10) from a desired position is substantially prevented. The washpipe assembly of the present invention has the advantage over the prior art assemblies of providing means for supporting the washpipe off the wall of a well bore or well bore casing (52), and thereby reducing the torque required to rotate the washover string and the tendency of the washover shoe (10) to deviate from its preferred path down the well bore.

La présente invention concerne des ensembles tubes de surforage utilisés dans les puits de forage; elle comprend un ensemble tube de surforage (2) muni d'une couronne de surforage (10) fixée à un tube de surforage (18), et un dispositif stabilisateur (22) de tube de surforage qui est placé sur le tube de surforage (18) de manière à empêcher dans une large mesure la couronne de surforage (10) de s'écarter d'une position désirée lors de l'utilisation. Par rapport aux ensembles de l'état antérieur de la technique, l'ensemble tube de surforage de la présente invention présente l'avantage de constituer un moyen qui permet de maintenir le tube de surforage éloigné de la paroi d'un puits de forage ou du tubage (52) d'un puits de forage et, par conséquent, de réduire la force de torsion nécessaire pour faire tourner la colonne de tubage et de restreindre la tendance de la couronne de surforage (10) à dévier d'un parcours préféré de descente le long du puits de forage.

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