دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: One of the mud pulse telemetry systems used in MWD.

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: a very small surge in pressure in the drilling mud as it returns to the surface. In measurement-while-drilling systems, mud pulses carry downhole information-much as radio waves carry sound-for interpretation at the surface.

a pressure pulse in the mud system. Some downhole tools can be controlled by mud pulses and some data is transmitted from bottom hole to the surface via pressure pulses.

n: one of the mud pulse telemetry systems used in MWD(q.v.).

n: one of the mud pulse telemetry systems used in MWD(q .v).