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What is the kelly on an oil rig?

Updated: 11/7/2022
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13y ago

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The Kelly is the rod attached to the top of the drill column in rotary drilling. It passes through the rotary table and is turned by it, but is free to slide down through it as the borehole deepens. It is also called the grief stem.

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13y ago
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Q: What is the kelly on an oil rig?
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