Seal assembly for use in a top drive

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 3/02 (2006.01) E21B 4/00 (2006.01) E21B 19/16 (2006.01)

Patent

CA 2646012

A top drive apparatus for wellbore operations, the top drive apparatus comprising a main body (24a), a motor apparatus, a rotatable member (18) and a gear system driven by the motor apparatus for rotating the rotatable member, a sealing assembly (10a) for providing a lubricant tight seal about the rotatable member (18), the sealing assembly (10a) comprising a seal carrier (20a) adjacent the rotatable member (18), a primary seal (14) on or in the seal carrier (20), the primary seal (14) sealingly contacting a perimeter of the rotatable member (18), at least one secondary seal (34) on or in the seal carrier (20) , the secondary seal (34) spaced from the rotatable member (18), the seal carrier (20) selectively movable to move the at least one secondary seal (34) into sealing contact with the rotatable member.

Appareil d'entraînement par le haut destiné aux opérations de forage, l'appareil d'entraînement par le haut comprenant un corps principal (24a), un moteur, un élément rotatif (18) et une transmission par engrenage entraînée par le moteur pour faire tourner l'élément rotatif, un assemblage de joints d'étanchéité (10a) pour produire un joint étanche au lubrifiant autour de l'élément rotatif (18), l'assemblage de joints d'étanchéité (10a) comprenant un porte-garniture d'étanchéité (20a) adjacent à l'élément rotatif (18), un joint d'étanchéité principal (14) sur ou dans le porte-garniture d'étanchéité (20), le joint d'étanchéité principal (14) étant en contact de manière étanche avec un périmètre de l'élément rotatif (18), au moins un joint d'étanchéité secondaire (34) sur ou dans le porte-garniture d'étanchéité (20), le joint d'étanchéité secondaire (34) étant écarté de l'élément rotatif (18), le porte garniture d'étanchéité (20) pouvant se déplacer de façon sélective pour mettre au moins un joint d'étanchéité secondaire (34) en contact étanche avec l'élément rotatif.

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