کلمه deviation survey یافت شد:
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.
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