Bore hole direction measuring instrument control

Details Bore hole direction measuring instrument control Bore hole direction measuring instrument control

1982-06-11

1985-07-02

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Combined

324221, 354 63, 346107W, G01N 2782, G03B 3700, G01D 942, G01R 3300

Patent

active

045271224

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: 2698920 (1955-01-01), Gieshe
patent: 3243697 (1966-03-01), Schmidt
patent: 3546478 (1970-12-01), Lindsey
patent: 4171578 (1979-10-01), Meador

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