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relaxed-filtrate oil mud

1. n. [Drilling Fluids]

An oil mud designed and maintained with a minimum of colloid-sized solids, typically by omitting fatty-acid soap and lime, and minimizing organophilic clays and fluid-loss additives. Relaxed filtrate oil mud increases drilling rate. A disadvantage is that filter cake formed on sands is not tight, can quickly become very thick, and can cause pipe to stick by differential pressure.

Synonyms: low-colloid oil mud

See: differential pressure stickingfiltrationgilsoniteoil-mud emulsifierorganophilic clay

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