Apparatus for sensing metal in wells

Details Apparatus for sensing metal in wells Apparatus for sensing metal in wells

1975-12-04

1977-05-10

Corcoran, Robert J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3312

Patent

active

040230929

ABSTRACT:
A new and improved wire line operated well tool for sensing metal in wells and the like, wherein a pair of coils spaced along the tool axis are moved through the well and respond unequally to ferrous material in the well. The coils are activated on alternate cycles of AC energy supplied from the surface, and the AC responses are transmitted back to the surface to indicate the location of the ferrous material. Means are provided to block any DC pulses, as could be caused by galvanic action, from disrupting the meaningful data.

REFERENCES:
patent: 2782365 (1957-02-01), Castel
patent: 2817808 (1957-12-01), Gieske
patent: 3088068 (1963-04-01), Hall, Jr. et al.

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