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1. n. [Drilling Fluids]

A salt made with stearic acid, which is a fatty acid, a type of organicĀ acidĀ derived from animal and vegetable fats and oils. Fatty acids are the raw materials used in the manufacture of many drilling-fluid additives, such as emulsifiers, oil-wetting agents and lubricants.

See: aluminum stearateamidesaminesbland coring fluiddrilling fluidemulsifierfatty acidfatty-acid soapgreasing outhydrolysisoil mudoil-mud emulsifierquaternary aminerheology modifiersoapsulfate-reducing bacteriasynthetic-base fluidtall oilwater mud