دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a South American tree that is a source of tannin extract, which was extensively used as a thinning agent for drilling mud, but is seldom used today.

n: the powder product that extracted from quebracho, it uses as viscosity reducing agent.

n: the active ingredient of quebracho and quebracho substitutes, such as mangrove bark, chestnut extract, and hem- lock.

n: Chemical extracted from the bark of trees and used as clay deflocculant in water muds. Tannins are moderate molecular weight, anionic polymers with complex structures. Quebracho is a tannin.