دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a colloidal clay, composed primarily of montmorillonite, that swells when wet. Because of its gel-forming properties, bentonite is a major component of waterbase drilling muds. See gel, mud.

a reference to colloidal clay (generally montmorillinite or smectite),generates plastic viscosity due to clay behavior, size and electrostatic layer. A slurry of which used for P&A Purposes will weigh no less than 9 ppg.

n: The constituents of a clay that provide its plastic properties. These include kaolinite, illite, montmorillonite and vermiculite.

n: The phenomenon that dilatability clay mineral (for example, montmorillonite) transform into non-dilatability clay mineral (for example, goeschwitzite) under the condition of temperature, pressure and chemistry.

n: a kind of soft rock with high montmorillonite and water,and which is easy to absorb water and swell ,as a rusult , the borehole lessens,the tools and bit are balled up ,jams the borehole ,and even leads other borehole problems

n: this kind of clay is usually made from calcium montmorillonite and sometimes made form bentonite and peptizing 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: A group of clay minerals that includes montmorillonite. This type of mineral tends to swell when exposed to water. Bentonite includes minerals of the smectite group.

a clay that exhibits water swelling and fines dissociation problems when it occurs in authogenic form and is reactive with the flowing fluid. Smectite clays such as bentonite generate viscosity by forming a colloid suspension in water.