Identification of pipe material in wells

Details Identification of pipe material in wells Identification of pipe material in wells

1980-02-06

1982-12-21

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

G01N 2772, G01N 2782

Patent

active

043651976

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 (1957-12-01), Gieske
patent: 3090910 (1963-05-01), Moran

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