DRILL PIPE CONNECTING AND DISCONNECTING APPARATUS

摘要

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 we ll axis on the rig floor.The wrench assembly includes upper and lower wrenches carried by the lifting mechanism. The wrench assembly includes a lower wrenc h for gripping a lower box coupling of a drill pipe section at the well center . An upper wrench is provided for spinning an upper pin coupling into or out o f threaded engagement with the lower box coupling. The upper wrench has two opposed spinner-roller pairs which translate between open and closed positio ns for spinning the upper pin coupling when in a closed position. The upper wrench also has two opposed jaw blocks which translate between open and clos ed positions for gripping the pin coupling in a closed position. The spinner roller pairs and the jaw blocks move in directions perpendicular to each oth er into and out of a cavity through which the well axis passes vertically. Torq ue cylinders are provided by which the upper wrench is torqued in a first or "torquing up" direction while the jaw blocks are gripping the pin coupling a nd in a second or "breaking loose" direction. A manipulator is pivotably carrie d on a rodsupported from the wrench assembly. The manipulator includes a remotely controlled arm and hand assembly which captures a drill pipe sectio n in its hand and transfers the drill pipe while being supported vertically by the drilling rig between the well axis and a position at the side of the wrench assembly.The drilling rig apparatus includes a bore arranged and designed for placement on the rig floor around the well axis. A slot is provided between frame members for placement of a pneumatically remotely controlled power slip manipulator for setting and releasing slips in the rotary table for supporting the drill pipe string in the well bore during connecting and disconnecting operations of drill pipe sections.