Definitions for "Drilling mud"
A mixture of clay, water, chemical additives, and weighting materials that flushes rock cuttings from a well, lubricates and cools the drill bit, maintains the required pressure at the bottom of the well, prevents the wall of the borehole from crumbing or collapsing, and prevents other fluids from entering the well bore.
A special mixture of clay, water, or refined oil and chemical additives pumped downhole through the drill pipe and drill bit. The mud cools the rapidly rotating bit, lubricates the drill pipe as it turns in the well bore, carries rock cuttings to the surface, serves as a plaster to prevent the wall of the borehole from crumbling or collapsing and provides the weight or hydrostatic head to prevent extraneous fluids from entering the well bore and control downhole pressures that may be encountered.
A mixture of clay, water, chemical additives and weighting materials that cool and lubricate the drill bit, carry rock cuttings from the well and control natural formation pressures.