Casing collar indicator for operation in centralized or decentra

Details Casing collar indicator for operation in centralized or decentra Casing collar indicator for operation in centralized or decentra

1983-08-12

1985-09-10

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

33178F, 166241, G01N 2772, G01R 3312, E21B 1710

Patent

active

045409412

ABSTRACT:
Apparatus for indicating the location of casing joints or collars in a cased borehole utilizing a magnetic field. An electrical detector coil array is disposed within an elongated body member having a plurality of arm member equidistant thereabout. Each arm member carries a casing contact pad having a permanent magnet mounted therein. The expansion force exerted on the arm members and the maximum range of expansion are independently adjustable.

REFERENCES:
patent: 2967994 (1961-01-01), Peterson
patent: 2994770 (1961-08-01), Monaghan et al.
patent: 3267365 (1966-08-01), Baker
patent: 3434046 (1969-03-01), Wilson et al.
patent: 3474541 (1969-10-01), Cubberly
patent: 3555689 (1971-01-01), Cubberly
patent: 3915229 (1975-10-01), Nicolas

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