Gripping system for a tong

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 19/06 (2006.01) E21B 19/16 (2006.01) E21B 19/18 (2006.01)

Patent

CA 2500954

In one embodiment, a gripping system for a tong for making up and breaking out tubulars is provided. The gripping system is coupled to the rotary of the tong. The gripping system includes an active jaw and two passive jaws disposed interior to the rotary. Preferably, the two passive jaws are separately by less than 120 degrees from each other and are pivotally connected to rotary. The gripping system is adapted and arranged to allow each passive jaw to react the same amount of force as the gripping force applied by the active jaw. In another embodiment, a rotary locking apparatus is provided to lock or unlock the rotary of the tong.

Selon un mode de réalisation, il s'agit d'un système de saisie de clé à tiges qui permet de visser ensemble des tiges de forage et de les dévisser. Le système de saisie est fixé à l'élément rotatif de la clé à tiges. Le système de saisie comprend une mâchoire active et deux mâchoires statiques à l'intérieur de l'élément rotatif. De préférence, les deux mâchoires statiques sont à moins de 120 degrés l'une de l'autre et sont fixées à l'élément rotatif de manière à pouvoir pivoter. Le système de saisie est conçu et disposé de manière à permettre à chaque mâchoire statique d'imprimer une force égale à la force de préhension appliquée par la mâchoire active. Dans un autre mode de réalisation, un appareil de verrouillage rotatif permet de verrouiller ou de déverrouiller l'élément rotatif de la clé à tiges.

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