دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: an operation made to determine the angle from which a bit has deviated from the vertical during drilling. There are two basic deviation-survey, or driftsurvey, instruments: one reveals the drift angle;the other indicates both the angle and the direction of deviation.

n: See bore-hole surveying.

a record of the deviation angle and the departure usually on a depth unit basis.

n: a device dropped or run down the drill stem on a wireline to a point just above the bit to measure the inclination of the well off vertical at that point. It does not measure the direction of the inclination. drift survey n: see deviation survey.

n: refer to inclinometer