E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 19/16 (2006.01)
Patent
CA 2261713
A top drive is used to connect successive lengths of casing. The casing is gripped by a mechanism (100) which comprises a support (5) which is attached to the top drive by a drive plate (4). A circular plate (9) is rotatably mounted in the support (5) and is associated with four jaw assemblies (50). In use the mechanism (100) is lowered onto a length of casing until the circular plate (9) engages the top of the casing. When the top drive is rotated in one sense the support (5) rotates relative to the circular plate (9). This causes toothed cylinders (14) to rotate which, in turn, rotates eccentric members (12 and 13) which advance the jaws (15) into gripping engagement with the casing. Further rotation of the top drive rotates the casing and screws it into the casing below.
On utilise un moteur de surface pour effectuer le raccordement des éléments successifs d'un tubage. Un élément de tubage est saisi par un mécanisme (100) comprenant un support (5) fixé au moteur de surface par une plaque d'entraînement (4). Une plaque circulaire (9), montée tournante dans le support (5) est associée à quatre jeux de mâchoires (50). En exploitation, le mécanisme (100) est abaissé sur un élément de tubage jusqu'à ce que la plaque circulaire atteigne le sommet de l'élément. Lorsque le moteur de surface tourne dans un sens, le support (5) tourne par rapport à la plaque circulaire (9) ce qui provoque la rotation des cylindres dentés (14) laquelle à son tour provoque la rotation d'éléments excentriques (12 et 13) qui font avancer les mâchoires (15) jusqu'à ce qu'elles saisissent le tube. Le moteur de surface en continuant à tourner entraîne l'élément de tubage qui vient se visser sur l'élément se trouvant sous lui.
Stokka Arnold
Marks & Clerk
Weatherford/lamb Inc.
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