1. adj. [Drilling Fluids]

Related to negatively charged ions. Clay surfaces, groups on polymer chains, colloids, and other materials have distinct, negatively charged areas or ions. Anionic characteristics affect performance of additives and contaminants in drilling fluids, especially water muds, in which clays and polymers are used extensively.

Antonyms: cationic

See related terms: acrylate polymer,  anion,  calcium contamination,  carbonate ion,  cation exchange capacity,  clay,  colloid,  mixed-metal hydroxide,  polar compound,  potassium ion,  sulfonated asphalt,  water mud