دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: an electronic device in which a probe is inserted into the drill stem near a directional drilling deflection tool. The probe sends continuous signals to the surface that show the direction and angle at which the bit is drilling. Readout devices greatly simplify accurate orientation of the drilling assembly so that a number of directional surveys can be eliminated. See directional drilling.