| NOUN | substance | drilling fluid, drilling mud | a mixture of clays and chemicals and water |
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| Meaning | A mixture of clays and chemicals and water; pumped down the drill pipe to lubricate and cool the drilling bit and to flush out the cuttings and to strengthen the sides of the hole. | |
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| Synonym | drilling mud | |
| Broader | lubricant, lubricator, lubricating substance, lube | A substance capable of reducing friction by making surfaces smooth or slippery |
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