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As a general guideline, MDIP should not vary by more than +- 0.3 degrees from the local magnetic dip angle or from survey to survey during a bit run. The local magnetic dip angle is determined by using magnetic modeling software or directly measuring it through infield referencing. Surveys which do not conform to this guideline should alert the field engineer that some magnetic interference or pipe movement is probable, or that there was a hardware failure. MDIP may also change abruptly from bit run to bit run due to a change in BHA configuration, which does not have the correct Monel spacing.
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