Gray Eot, Inc.

David Curtis Fletcher

William R Hamilton

Donald D Rae

Drilling rig apparatus for connecting and disconnecting well pipe at a drilling rig. A remotely controlled power wrench assembly is mounted on a remotely controlled lifting mechanism attached to a base spaced about the well axis on the rig floor. The wrench assembly includes upper and lower wrenches carried by the lifting mechanism. The wrench assembly includes a lower wrench for gripping a lower box coupling of a drill pipe section at the well center. An upper wrench is provided for torquing and spinning an upper pin coupling into or out of threaded engagement with the lower box coupling. A manipulator is pivotably carried on a rod supported from the wrench assembly. The manipulator captures a drill pipe section and transfers the drill pipe section between the well axis and a position at the side of the wrench assembly. A slot is provided between frame members of the base for placement of a power slip manipulator for setting and releasing slips in the rotary table.

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Houston, TX, United States of America

David Curtis Fletcher