دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a device used by directional drillers to determine which way to turn deflection tools to get the desired drift angle in a hole. This device comprises a protractor and various straight-edged scales that pivot around the protractor to figure the drift angle.

n: a device used to calculate the required orientation of a deflection tool.