Used to rotate the drill string during the drilling process, the top drive is a motor that is suspended from the derrick, or mast, of the rig. These power swivels boast at least 1,000 horsepower ...

(KWCH) - A Wichita man died from his injuries in a crash reported Wednesday afternoon in Sheridan County in which he was ejected from a semi that was hauling an oil derrick that contacted live ...