Abstract: hydraulic slip unit for a rotary drive of a rig floor comprises a main body including hydraulically operated slips disposed within a passage that can engage a pipe string within the passage to transmit vertical loads and torque for rotation of the pipe string. A hydraulic swivel is connected to the main body, wherein the swivel includes a first portion attached to the main body to rotate therewith and a second portion slidably mounted to the first portion to rotate relative thereto. Both first and second portions include oil passages therethrough in fluid communication with one another during relative rotation. During rotation of the main body, the second portion is connectable to static hydraulic supply lines that do not rotate, and fluid from the supply lines can travel through the respective oil passages to provide hydraulic power to the slips in the main body to selectively move them.

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.

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.