Colloid 1
Colloid 1 : (adj.) 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: anion, calcium contamination, clay extender, clay-water interaction, colloidal solids, colloidal suspension, dispersion, hydration, micelle, oil mud, oil-mud emulsifier, peptize, peptized clay, peptizing agent, polymer, prehydration, silt
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