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: I. a term used for particles smaller than \1156 millimetre (4 microns) in size, regardless of mineral composition. 2. a group of hydrous aluminum silicate minerals (clay minerals). 3. a sediment of fine clastics.

n: (1) A soft, variously colored earth, commonly hydrous silicates of alumina, formed by the decomposition of feldspar and other aluminum silicates. Clay minerals are essentially insoluble in water but disperse under hydration, grinding, or velocity effects.

a fine grain (<0.00015” or about 4 microns) – finely crystalline silica sheet minerals. Usually of silicate composition. In oil field terms, the most common clays are Smectite (montmorillinite),illite, kaolinite and chlorite. The characteristic for autho

typically mixtures of illite and smectite or other clays. These may or may not be water sensitive.

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.