Importance

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Abstract

Apparatus for use during connection of a length of pipe to the upper end of a drill string, preferably in a top drive drilling arrangement, and including a back-up tool for retaining the upper end of the drill string against rotation as the added length of pipe is connected threadedly thereto. This back-up tool is mounted for movement between an active position for engaging and holding the upper end of the drill string and a laterally retracted position. A stabbing unit associated with the back-up tool acts to locate the additional length of pipe while it is connected to the string, and is mounted for movement with the back-up tool between the active and inactive positions of the latter, and also for movement relative to the back-up tool, in the active position of that tool, between an extended position for engaging and holding the additional length of pipe at a location offset laterally with respect to the back-up tool and a stabbing position locating the additional length of pipe in alignment with the back-up tool for connection to the string.

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First Claim