Colloidal 1
Colloidal 1 : (adj.) Drilling Fluids. Referring to 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 such as bentonite clay, starch particles and many polymers become colloidal when used in a mud. Oil muds contain colloidal emulsion droplets, organophilic clays and fatty-acid soap micelles. See: alum, clay-water interaction, colloid, colloidal solids, micelle, oil mud, oil-mud emulsifier, peptizing agent, polymer, prehydration
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