Variable speed wellhead top drive

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/12 (2006.01) F04B 47/00 (2006.01) F04B 53/00 (2006.01) F16H 3/093 (2006.01)

Patent

CA 2619861

A wellhead top drive is provided that includes a driving gear, a driven gear, and a movable member. The movable member has a first intermediate gear toward a first end and a second intermediate gear toward a second end. The movable member is movable between a first position and a second position, such that in the first position, the driving gear drives the driven gear via the first intermediate gear, and in the second position, the driving gear drives the driven gear via the second intermediate gear.

L'invention concerne un mécanisme d'entraînement supérieur de tête de puits composé d'un pignon menant, d'un pignon mené et d'un élément mobile. L'élément mobile comporte un premier pignon intermédiaire vers sa première extrémité et un deuxième pignon intermédiaire vers sa deuxième extrémité. L'élément mobile peut être déplacé d'une première position à une deuxième position, de sorte que dans la première position, le pignon menant entraîne le pignon mené par l'entremise du premier pignon intermédiaire, et, dans la deuxième position, le pignon menant entraîne le pignon mené par l'entremise du deuxième pignon intermédiaire.

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