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invert-emulsion oil mud

1. n. [Drilling Fluids]

An outdated distinction between two types of oil muds. In the past, invert-emulsion oil muds were those with more than 5 vol.% emulsified water, and oil-base muds were those with less than 5 vol.% water. Today, this distinction is not pertinent because the general term oil mud covers all water concentrations.

See: asphaltemulsionfatty-acid soaphectoriteinterfacial tensioninvert emulsionmudoil contentoil mudoil-base mudoil-in-water emulsionoil-mud emulsifierorganophilic clayorganophilic ligniterheology modifiersurface tensionsynthetic-base fluidsynthetic-base mudwater-in-oil emulsion

Classification chart for nonwater-based drilling fluids.

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