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mud

1. n. [Drilling Fluids]

A term that is generally synonymous with drilling fluid and that encompasses most fluids used in hydrocarbon drilling operations, especially fluids that contain significant amounts of suspended solids, emulsified water or oil. Mud includes all types of water-base, oil-base and synthetic-base drilling fluids. Drill-in, completion and workover fluids are sometimes called muds, although a fluid that is essentially free of solids is not strictly considered mud.

Synonyms: drilling mud

See: conventional mudemulsion mudinvert-emulsion oil mudlubricantmud weightmudding upnative-solids mudoil mudpillreserve-mud pitreturnsslugslurryspud mudsuspended solidsunweighted mudweighted mud

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