Society of Petroleum Engineers UET Lahore Chapter - *Top Drive* A top drive is a mechanical device on a drilling rig that provides 'clockwise' torque to the drill string to drill a
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![Top drive swivel sub showing the stator and data cable that connects... | Download Scientific Diagram Top drive swivel sub showing the stator and data cable that connects... | Download Scientific Diagram](https://www.researchgate.net/publication/241788012/figure/fig3/AS:298548974374914@1448191030684/Top-drive-swivel-sub-showing-the-stator-and-data-cable-that-connects-the-stator-to-the.png)