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colloid

1. n. [Drilling Fluids]

A finely divided, solid material, which when dispersed in a liquid medium, scatters a light beam and does not settle by gravity; such particles are usually less than 2 microns in diameter. Some drilling fluid materials become colloidal when used in a mud, such as bentonite clay, starch particles and many polymers. Oil muds contain colloidal emulsion droplets, organophilic clays and fatty-acid soap micelles.

See: anioncalcium contaminationclay extenderclay-water interactioncolloidal solidscolloidal suspensiondispersionhydrationmicelleoil mudoil-mud emulsifierpeptizepeptized claypeptizing agentpolymerprehydrationsilt

Illustration of the size of a colloid
Illustration of the size of a colloid.

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