دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the density of a cement slurry, expressed in pounds per gallon, pounds per cubic foot, kilograms per litre, and so on.

n: The weight per volume slurry.

n: the volume of slurry obtained when one sack of cement is mixed with the desired amount of water and additives (such as with accelerators and fluid- loss control agents).

n: The volume of slurry obtained when one sack of cement is mixed with the desired amount of water and other additives, usually given in units of m3/kg or ft3/sk (sack).

n: a prover with a volume between detectors that does not permit a minimum accumulation of 1,000 direct (unaltered) pulses from the meter. Small-volume provers require meter pulse discrimination by pulse interpolation counter or other techniques to increase the resolution.

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.

an expression to predict change of direction of a wave crossing the boundary between two isotropic (no variation in properties with direction) media.

n: a tank safety device that seals the vapor vent manually and prevents vapor from escaping into a fire, thus snuffing out the flame.

n: (Na) one of the alkali metal elements with a valence of 1, an atomic number of about 23. Numerous sodium compounds are used as additives to drilling fluids.

n: Na2CO3, used extensively for treating various types of calcium contamination. Also called soda ash.

n: A chemical with the formula Na2CO3. It is called soda ash at the drilling rig and is used to treat most types of calcium ion contamination in freshwater and seawater muds. For cement contamination, sodium bicarbonate is used. Calcium ions from drilling gy

n: Usually as filtrate reducer and viscosifier.

n: Na2CrO4. See chromate.

n: A type of salt in which chromium atoms are in the plus-6 valence state, such as potassium chromate, K2CrO4. Chromium compounds of various types have been used in lignite and lignosulfonate and other mud additives to enhance thermal stability. Since the la