a water-based or oil-based suspension of clays pumped into an oil well during drilling in order to seal off porous rock layers, equalize the pressure, cool the bit, and flush out the cuttings. Also called drilling fluid .
DRILLING MUD
Meaning of DRILLING MUD in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012