Method of distinguishing material characteristics in a well bore

Details Method of distinguishing material characteristics in a well bore Method of distinguishing material characteristics in a well bore

1985-01-23

1987-11-03

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Combined

324221, 346107W, G01N 2772, G01N 2782, G01R 3312, G01D 942

Patent

active

047045795

ABSTRACT:
A combination of magnetics and a special geometric environment is employed to distinguish whether an instrument is positioned within a pipe formed of magnetizable or non-magnetizable material, and is the basis, in part, for a method and an apparatus used in controlling picture taking at the bottom of a well bore. A coil is energized repetitively in a circuit in which the voltage across the coil, or the current that flows through the coil, can be measured. Whether the coil is in a magnetic or non-magnetic environment is determined by the magnitude of the change in coil voltage or current.

REFERENCES:
patent: 2250703 (1941-07-01), Crites et al.
patent: 2817808 (1951-12-01), Gieshe
patent: 3189819 (1965-06-01), Schmidt
patent: 3235795 (1966-02-01), Uozumi
patent: 3588908 (1971-06-01), Lindsey
patent: 4171578 (1979-10-01), Meador

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