دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: refer to measurement while drilling

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.)).

n: the torque on bit measured by measurement while drilling

using the formation data generated by a measurement while drilling system to assist in drilling a wellbore to a specific target in the formation.

n: (MWD) 1. directional and other surveying during routine drilling operations to determine the angle and direction by which the wellbore deviates from the vertical. 2. any system of measuring downhole conditions during routine drilling operations.

n: a mothod of measuring parameters downhole and sending the results to surface without interrupting routine drilling operations.a special tool containing sensors,power supply and transmitter is installed as part of BHA (q.v.).the information is transmitted

downhole logging while drilling. “Logging While Drilling” is one form of measurement while drilling" - to differentiate it from mud logging, wireline logging, etc. See Logging While Drilling.

abbr: measurement while drilling.

see measurement while drilling or logging while drilling.