A new, hydraulic motor-driven 85-ton power swivel from Logan Oil Tools provides smooth, shock-free torque and reduces drill string damage. It is rated to support tensile pipe loads of 85 tons at zero rpm and 45 tons dynamic load at 100 rpm. The compact, swivel head design weighs only 1,163 lb and fits most drilling or workover masts. For most applications, the power swivel eliminates the use of dangerous spinning chains, tongs, and Kelly spinners.

It facilitates drilling with longer drill string lengths before the rig must be shut down to add pipe. Stops and starts are thereby reduced — improving rig efficiency and reducing wear on the pump, draw works, and other rig equipment. The power swivel uses a closed-loop hydraulic system with variable displacement, reversible over-center pumps, and air or electric controls. A wireless remote is also available. Speed control is continuously variable over the entire operating range.

Pressure compensating type torque control overrides the speed control to maintain maximum torque at 3,950 ft-lb. Torque limits on the power unit can be set, eliminating the potential danger of twist-offs or swollen boxes in the drill string. An integral rotary swivel bearing, floating washpipe assembly and gooseneck connection eliminate the need for a separate rotary swivel. A 2 ¼-in. bore gooseneck and washpipe assembly allows circulation through the 2-in. ID stem while rotating or in static mode. An access plug allows wireline to be run through the unit.

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