دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. in general, a substance added in small amounts to a larger amount of another substance to change some characteristic of the latter. In the oil industry, additives are used in lubricating oil, fuel, drilling mud, and cement. 2. in cementing, a substance added to cement to change its characteristics to satisfy specific conditions in die well. A cement additive may work as an accelerator, retarder, dispersant, or other reactant.

n: The agent put into the drilling fluid in order to change some performances of the drilling fluid or slurry.

a compound incorporated into a gas, liquid, or solid system to alter the properties for a particular purpose.

n: a material added to cement to change its properties. Chemical accelerators, chemical retarders, and weightreduction materials are common additives. See cementing materials.

n: The general name of treating chemical for adjust the performance of cement slurry.

a chemical additive such as lignosulfonate, salt in low concentration or most muds that slow down the cement.

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.

n: a cement in which the thickening time is extended by adding a chemical retarder.

n: The cement that can delaying solidify.

n: a substance added to cement to prolong the setting time so that the cement can be pumped into place. Retarders are used for cementing in high-temperature formations.

n: A chemical additive used to increase the thickening time of cement slurries or similar fluids that may have a limited pumping time. The increased pressure and temperature typically associated with deep wellbores requires the use of such performance-enhanc

a chemical that slows a reaction. In cementing, retarders slow the set time of the cement and prolong the pumpability of the cement.

n: a manufactured cement in which the thickening time is extended by the use of a coarser grind, the elimination of the rapid hydrating components in its composition, and the addition of a chemil retarder. API classes N, D, E, and F are slow-set cements.

n: The cement that can delaying solidify.

n: common table salt, NaCl. It is sometimes used in cement slurries as an accelerator or a retarder, depending on the concentration.

n: NaCl,one of the main material of saliferous drilling fluid.