Abstract: An apparatus for providing hydraulic power below a rotary table of a snubbing unit, comprising a swivel assembly including at least one hydraulic port therein. The swivel assembly defines a first hydraulic channel connected to the at least one hydraulic port. A rotary mounted within a rotary table has a second hydraulic port therein below the rotary table. The rotary defines a second hydraulic channel therein connected to the second hydraulic port. The rotary is connected to the swivel assembly such that the first hydraulic channel aligns with the second hydraulic channel to provide for hydraulic fluid flow therebetween. Hydraulic fluid is provided from the at least one hydraulic port through the first hydraulic channel of the swivel assembly and the second hydraulic channel of the rotary to the second hydraulic port below the rotary table.

Abstract: A joined pipe injector for the oil-field industry that is capable of handling strings of jointed pipe. The injector includes gripper block assemblies removably mounted to a pair of looping, sprocket-supported drive chains facing a pipe/tubing passage therebetween. The gripper block assemblies have self-adjusting pipe inserts biased with springs to grip tubing or pipe of constant nominal diameter or pipe having both nominal and secondary diameter including upset joints. An insert guide is provided at the end of the pipe/tubing passage to postpone contact between the pipe inserts and the pipe when the respective gripper block assemblies are moving with curving motion around the sprockets. The injector is designed to operate either independently, or in conjunction with a conventional work-over and/or drill rig.

Abstract: A powered clamp for transmitting torque to a drill pipe comprises an outer housing disposed around an axial central passage and connected to a plurality of carrier guides defining a plurality of radial slots. An inner housing defines a coaxial central passage, is rotatably connected to the outer housing, and defines a plurality of actuator slots having a spiral configuration relative to the centerline axis. A carrier is slidably disposed in each slot between the carrier guides and has a carrier pin extending into a respective one of the actuator slots. At least one powered linear actuator is connected between the outer and inner housing to selectively rotate the housings relative to one another. This rotation causes the carriers to move radially inward and outward as the carrier pins travel along the actuator slots, selectively gripping and releasing the drill pipe.