دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: see Buys-Ballots law. barite n: barium sulphate, BaSO4;a mineral frequently used to increase the weight or density of drilling mud. Its relative density is 4.2 (i.e., it is 4.2 times denser than water). See barium sulphate, mud.

n: a chemical compound of barium, sulphur, and oxygen (BaSﾰ4),which may form a tenacious scale that is very difficult to remove. Also called barite.

n pi: a slurry of portland cement and water and sometimes one or more additives that affect either the density of the mixture or its setting time. The portland cement used may be high early strength, common (standard),or slow setting. Additives include accelerators (such as calcium chloride),retarders (such as gypsum),weighting materials (such as barium sulphate),lightweight additives (such as bentonite),or a variety of lost circulation materials (such as mica flakes).

n: The bonding material for cementing.