Device for automatically compensating the magnetism of drill...

Details Device for automatically compensating the magnetism of drill... Device for automatically compensating the magnetism of drill...

G - Physics

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G01V 3/26 (2006.01) E21B 7/04 (2006.01) E21B 17/16 (2006.01) E21B 47/022 (2006.01) G01R 33/025 (2006.01) G01V 3/28 (2006.01)

Patent

CA 1215115

11 ABSTRACT OF THE DISCLOSURE Device for automatically compensating the magnetism of drill rods. Each end of the rods surrounding the positioning sensor is provided with a coil, through which passes a current, whose intensity is automatically regulated as a function of the sensor readings in order to make the gradient of the magnetic field due to the rods and to the field itself zero within the sensor area. (Fig. 4)

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