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oil-base mud

1. n. [Drilling Fluids]

An invert-emulsion mud, or an emulsion whose continuous phase is oil. In the past, the term referred to an oil mud containing less than about 5 vol.% water. This definition, at the time, distinguished mud with less than 5 vol.% water from invert-emulsion oil muds, which had more than 5 vol.% water. Today, this distinction is not practical because most commercial oil muds can be formulated with more or less than 5 vol.% water using essentially the same types of products.

Synonyms: invert-emulsion oil mud

See: aliphatic compoundaniline point testelectrical stability testinvert emulsionoil contentoil mudspotting fluidsynsynthetic-base fluid

Classification chart for nonwater-based drilling fluids.

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