Definitions for "Drilling Fluid"
Fluid circulated through the wellbore during drilling operations to cool the drill bit, remove rock cuttings, prevent the borehole walls from caving in and constrain high pressure formation fluids. In a liquid, non-aerated state, the drilling fluid or 'mud' enables the transmission of hydraulic pressure pulses from a downhole Measurement While Drilling (MWD) device to the surface.
a mixture of clays and chemicals and water; pumped down the drill pipe to lubricate and cool the drilling bit and to flush out the cuttings and to strengthen the sides of the hole
a fluid specially designed to be circulated through a wellbore as the wellbore is being drilled to facilitate the drilling operation