دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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. Although a mixture of barite, clay, water, and other chemical additives is the most common drilling fluid, wells can also be drilled by using air, gas, water, or oil-base mud as the drilling mud. Also called circulating fluid, drilling mud. See mud.

n: The fluid circulated through the drill string and up the annulus back to surface under normal drilling operations. Usually referred to as mud.