Electricity: measuring and testing – Of geophysical surface or subsurface in situ – By magnetic means
Patent
1986-10-08
1988-12-13
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
By magnetic means
33304, 166 665, 175 45, 324207, G01V 311, E21B 704, E21B 47022
Patent
active
047913738
ABSTRACT:
A method of locating, from a relief well, a target borehole of a deep well at a substantial distance below the earth's surface, while approaching the target borehole at a large angle of intersection. A homing tool incorporating a magnetic field sensor having its axis of maximum sensitivity parallel to the axis of the relief well detects an A.C. magnetic field produced by alternating current in the target borehole to provide the data required for directing further drilling of the relief well.
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Edmonds Warren S.
Eisenzopf Reinhard J.
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