Device for automatically compensating the magnetism of drill str

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

1984-03-01

1987-03-10

Karlsen, Ernest F.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

By magnetic means

324244, 175 45, 33313, G01V 326, G01R 33025, E21B 47022

Patent

active

046493492

ABSTRACT:
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.

REFERENCES:
patent: 3311821 (1967-03-01), Brunel
patent: 4163324 (1979-08-01), Russell et al.
patent: 4463314 (1984-07-01), Wilson
patent: 4529939 (1985-07-01), Kuckes

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