As a very practical measuring instruments, non-magnetic drill collars play an important role in the drilling operations. In order to ensure the accuracy of magnetic measurement instruments, the length of the non-magnetic drill collar must be chosen rationally.
The length of the non-magnetic drill collar should be selected according to the angle of the well and the azimuth angle of the well. When the angle of inclination is large, the length of the non-magnetic drill collar should be lengthened. When the center of the non-magnetic drill collars are required to use the centralizer, we must be noted that the impact of the centralizer, the best way is to make centralizer to match with non-magnetic drill collars plus steel sleeve, this can reduce the impact of magnetic measuring instruments, but also save the price of non-magnetic steel.
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