Three magnet casing collar locator

Details Three magnet casing collar locator Three magnet casing collar locator

1987-11-19

1989-02-28

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

336110, G01N 2772, G01N 2782, H01F 2100

Patent

active

048089257

ABSTRACT:
For use with casing having flush joint collars, a detection system is set forth which comprises a tool body made of nonmagnetic material and enclosing abutted first, second and third permanent magnets. The magnets are axially aligned, abutted so that opposing poles are in contact with one another, thereby forming a magnetic field from the center magnet which is focused out into the metal of the casing. Separate detection coils spaced along the tool body detect signals induced by variations in magnetic reluctance as the tool traverses the cased well.

REFERENCES:
patent: 2967994 (1961-01-01), Peterson
patent: 4710741 (1987-12-01), Walkow

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