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
Fluids continuously circulated down the wellbore, to cool and lubricate the drill bit, lubricate the drill pipe, carry rock cuttings to the surface and control down hole pressure.
fluid used in the wellbore to lubricate and cool the bit, control bottom-hole pressures, and remove cuttings.
n: circulating fluid, one function of which is to lift cuttings out of the wellbore and to the surface. It also serves to cool the bit and to counteract downhole formation pressure.
Fluid used to lubricate the bit and convey drill cuttings to the surface with rotary drilling equipment. Usually composed of bentonite slurry or muddy water. Can become contaminated, leading to cross contamination, and may require special disposal. Not used with DP methods