Apparatus for locating an elongated conductive body by electroma

Details Apparatus for locating an elongated conductive body by electroma Apparatus for locating an elongated conductive body by electroma

1988-12-30

1990-06-12

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

166 665, 166250, 175 45, 175 50, 324342, 324343, 324346, G01V 328, G01V 308, E21B 704, E21B 4702

Patent

active

049336401

ABSTRACT:
A method and apparatus for determining the distance and direction of a well from a borehole. A toroidal inductor surrounds a drill stem within a borehole. The inductor acts as a primary for a transformer, with the drill stem, the earth surrounding the borehole, and electrically conductive material at the target well forming a single loop transformer secondary. An oscillator is connected to the primary to produce an induced AC current in the secondary. Secondary current flowing in the target well produces an AC secondary magnetic field which is detected at the borehole.

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