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A top drive is a mechanical device on a drilling rig that provides clockwise torque to the drill string to facilitate the process of drilling a borehole. It is an alternative to rotary table. It is located at the swivel place and allows a vertical movement up and down the derrick.An advantage of a top drive is that it allows the drilling rig to drill longer sections of a stand of drill pipe. A rotary table type rig can only drill 30-foot (9.1 m) (single drill pipe respectively) sections of drill pipe while a top drive can drill 60–90-foot (18–27 m) stands (double-triple respectively. A triple being three joints of drillpipe screwed together.), depending on the drilling rig type. Having longer sections of drill pipe allows the drilling rigs to drill deeper sections of the wellbore, thus making fewer connections of drill pipe.
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