دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the tools which is lowed into the non-magnetic drill collar by conductor line and used to receive and transmit the directional data

n: term used for a non-magnetic drill collar made from specially treated alloys so that it does not affect magnetic surveying instruments.

n: directional sub fixed next to the non-magnetic drill collar, in which are a muff and a directive bonding that direct to orientation of deflecting tool. Its method must used with magnetic direction.

n: a collar that will isolate a magnetic compass from local magnetic effects (see monel).