Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Patent
1992-04-27
1993-11-02
Eldred, J, Woodrow
Communications: electrical
Wellbore telemetering or control
Selective control of subsurface equipment
3408538, 175 45, 32420711, 324220, 324244, 33304, 33310, 33355R, G01V 100
Patent
active
052587550
ABSTRACT:
A magnetic field guidance system for guiding a movable carrier such as a drill assembly with respect to a fixed target includes a pair of magnetic field sources at one location, such as the carrier, and a highly sensitive magnetic field detector at the other location, or target. The first field source is driven by an alternating current to produce a low frequency alternating axial field, while the second source is a magnet which produces a field perpendicular to the axis of the first field. Where the magnetic field sources are mounted on a rotatable drill assembly, the second source may be a permanent magnet which rotates with the drill assembly. The detector may be a fluxgate magnetometer which senses the direction of the target location with respect to the direction of the axial field by determining the deviation from perpendicular of the two magnetic fields at the target location.
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Eldred J, Woodrow
Vector Magnetics Inc.
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