Rotary table (drilling rig)
- Rotary table (drilling rig)
A [http://www.glossary.oilfield.slb.com/Display.cfm?Term=rotary%20table Rotary table] is a mechanical device on a drilling rig that provides clockwise (as viewed from above) rotational force to the drill string to facilitate the process of drilling a borehole.
In the diagram, #20 (in blue) is the rotary table. The "kelly" #19, is inserted through the center of the rotary table and kelly bushings, and has free vertical (up & down) movement to allow downword force to be applied to the drill string, while the rotary table "rotates" it. (Note: Force is not actually applied from the top (as to push) but rather the weight is at the bottom of the drill string like a pendulum on a string.)
Rotary speed is the number of times the rotary table makes one full revolution in one minute (rpm).
See Drilling rig (petroleum) for a detailed description of the diagram.
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