دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

abbr: the phenolphthalein alkalinity of the filtrate, reported as the number of millilitres of 0.02 Normal (N/50) acid required per millilitre of filtrate to reach the phenolphthalein end point. Pc is a measure of the alkalinity of the drilling mud. Usually, muds should have a high alkalinity (pH) to ensure adequate performance.

friction pressure – may be annulus or tubing.