دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the pressure at a given temperature for a hydrocarbon system of fixed composition at which the vapourliquid equilibrium values of the various components in the system become or tend to become unified. The convergence pressure is used to adjust vapour-liquid equilibrium values to the particular system under consideration. conversion n: the change in the chemistry of a mud from one type to another. Reasons for making a conversion may be (1) to maintain a stable well bore, (2) to provide a mud that will tolerate higher weight, or density, (3) to drill soluble formations, or (4) to protect producing zones. Also called a breakover.