Method for determining the location of a deep-well casing by magnetic field sensing
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United States of America Patent
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Oct 13, 1987
Grant Date -
N/A
app pub date -
Apr 4, 1986
filing date -
Apr 4, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Logging apparatus for measuring alternating magnetic fields generated by electric current flow on a subterranean target near a borehole is disclosed. Electric current of a predetermined temporal form is made to flow on the target; the resulting magnetic field is measured by magnetometers in a downhole sonde. The orientation of the sonde is fixed by various combinations of gyroscope, accelerometer, magnetometer measurements, and borehole survey data.
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