Downhole electrode for well guidance system

Details Downhole electrode for well guidance system Downhole electrode for well guidance system

1996-04-17

1997-10-14

Tsay, Frank

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

175 50, 166 665, E21B 704

Patent

active

056762127

ABSTRACT:
A borehole guidance system for guiding a well being drilled with respect to an existing reference well includes a multi-sectioned casing in the reference well. A selected section of the casing, usually the lowest section, is electrically conductive and the next adjacent section is electrically nonconductive. A wireline connects a current source on the surface to the selected conductive section to produce a reference current in the well. The reference current is injected into the earth and dissipated so that the current produces a reference magnetic field surrounding the well which is unaffected by return currents.

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