Method and apparatus for forming tubular connections

E - Fixed Constructions – 21 – B

Patent

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E21B 19/16 (2006.01)

Patent

CA 2679386

The apparatus of the present invention is directed to a replacement cage assembly to modify a conventional power tong to enable the power tong to grip and rotate smaller diameter tubular segments. The method of the invention is directed to modifying a power tong to grip and rotate a tubular segment of a diameter smaller than could be gripped by the unmodified power tong. The invention provides a rotary gear insert, having an outer first cam surface and an interior second cam surface rotatably captured intermediate an upper cage plate and a lower cage plate and slidably receivable within the conventional rotary gear of the power tong and to cam and rotate a plurality of replacement gripping jaws pivotally captured adjacent the second cam surface and intermediate the upper cage plate and the lower cage plate.

L'invention concerne un ensemble de cage de remplacement (106) pour modifier une clé à commande hydropneumatique classique (100) pour permettre à la clé à commande hydropneumatique de saisir et de faire tourner des segments tubulaires de diamètre plus petit (90). Le procédé de l'invention concerne la modification d'une clé à commande hydropneumatique (100) pour qu'elle saisisse et fasse tourner un segment tubulaire d'un diamètre plus petit que celui qui pourrait être saisi par la clé à commande hydropneumatique non modifiée (100). L'invention propose un insert d'engrenage rotatif (240), ayant une première surface de came extérieure (42) et une seconde surface de came intérieure (242), saisie de manière rotative entre une plaque de cage supérieure (230) et une plaque de cage inférieure (210) et pouvant être reçue de manière coulissante dans l'engrenage rotatif classique de la clé à commande hydropneumatique (100) et pour servir de came et faire tourner une pluralité de mâchoires de serrage de remplacement (220), (221) saisies de manière pivotante de façon adjacente à la seconde surface de came (240) et entre la plaque de cage supérieure (230) et la plaque de cage inférieure (210).

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