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.

n: commercial clay chiefly of the calcium montmorillonite type and having a yield of approximately 15 barrels per ton (2,385 litres per tonne).

n: a clay mineral often used as an additive to drilling mud. It is a hydrous aluminum silicate capable of reacting with such substances as magnesium and calcium. See bentonite.

n: a clay mineral common;y used as an additive to drilling muds. Sodium montmorillonite is main constituent in bentonite. Calcium montmorillonite is the main constituent in low-yield clays.

a water reactive clay mineral, now called smectite, a common component of bentonite.

n: see hydraulic control pod. yield n: the number of barrels of a liquid slurry of a given viscosity that can be made from a ton of clay. Clays are often classified as either high- or low-yield. A ton of highyield clay yields more slurry of a given viscosity than a low-yield clay.