1. n. [Drilling Fluids]

Another term for deflocculant, a thinning agent used to reduce viscosity or prevent flocculation; incorrectly called a "dispersant." Most deflocculants are low-molecular weight anionic polymers that neutralize positive charges on clay edges. Examples include polyphosphates, lignosulfonates, quebracho and various water-soluble synthetic polymers.

Synonyms: deflocculant

Antonyms: flocculant

See: clay-water interaction,  conventional mud,  gel strength,  polar compound,  rheology,  yield point