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Measuring the Paramagnetic Properties of Nonmagnetic Drill Collars

Due to the need for high accuracy in these directional measurements, the nonmagnetic characteristics of the drill collar must be guaranteed over its entire service. Therefore, testing is performed on both newly manufactured collars and collars having many hours of service. This paper explores these testing techniques in more detail.

API, API Specification 7: Specification for Rotary Drill Stem Elements, 40th edition, Washington, DC, American Petroleum Institute, 2002. Fontenot, K., W. Lesso, R.D. Strickler and T.M. Warren, “Using Casing to Drill Directional Wells,” Oilfield Review, Vol. 17, Summer 2005, pp. 44–61. Vereinigte Edelstahlwerke AG, “Non-Magnetic Drill Collars,” Tube International, June 1985, pp. 94–95.
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