دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: signals transmitted from an instrument located downhole to a receiving monitor on the surface-a surfacereadout instrument. Downhole telemetry may be transmitted via a special wireline or via mud pulse (much as radio signals are transmitted through the air). Frequently, downhole telemetry is employed in determining the drift angle and direction of a deviated wellbore. See measurement while drilling.

n: The process whereby signals are transmitted from a downhole sensor to a surface readout instrument. This can be done by a conductor line (as on steering tools) or by mud pulses (as in MWD tools (q.v.)).