دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a classification given to a group of commercial drilling-clay preparations having a yield of 35 to 50 barrels (5,565 to 7,950 litres) per ton and intermediate between bentonite and lowyield clays. Usually prepared by peptizing low- yield calcium montmorilionite clays or, in a few cases, by blending some bentonite with the peptised low-yield clay.