دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. the area in which underground pressures begin to change from normal to abnormally high as a well is being deepened. 2. the areas in the drill stem near the point where drill pipe is made up on drill collars.

n: The transition formation from the normal formation pressure to abnomal formation pressure.