Multi-arm stabilizer for a drilling or boring device

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/10 (2006.01) E21B 23/04 (2006.01)

Patent

CA 2128903

A control (1) for at least two stabilizing arms (2) in a drilling or boring device, and particularly arms (2) in a drilling of boring head. Each arm has an end pivotable about an axis (6) parallel to the drilling head axis (4) and including, for each arm (2), a piston (8) for pivoting the arm about said axis (6) between two cad positions, i.e. a first position in which it is housed in the head and a second position in which it projects therefrom. Control (10) and synchronizing (11) means are respectively arranged to move the pistons (8) away from the drilling fluid substantially simultaneously in the same direction and with the same amplitude.

Commande (1) d'au moins deux bras de stabilisation (2) dans un dispositif de forage ou de carottage, en particulier de bras de stabilisation (2) dans une tête de forage ou de carottage, chaque bras ayant une extrémité montée à pivotement autour d'un axe (6) parallèle à l'axe (4) de la tête de forage, comprenant, par bras (2), un piston (8) agencé pour faire pivoter le bras (2) autour de l'axe (6) susdit afin qu'il occupe deux positions extrêmes, une première position où il est logé dans la tête et une seconde position où il fait saillie par rapport à cette tête, des moyens de commande (10) et des moyens de synchronisation (11) étant agencés respectivement pour déplacer les pistons (8) à partir du fluide de forage et pour que les pistons (8) agissent sensiblement simultanément dans un même sens et suivant une même amplitude.

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