System located in drill string for well logging while drilling
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United States of America Patent
Stats
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Jul 16, 1985
Grant Date -
N/A
app pub date -
Jan 10, 1983
filing date -
Jan 10, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Logging apparatus for measuring magnetic fields while drilling is disclosed. An electrode is located within a drill string and receives alternating current which is conducted to the drill string and from the drill string is injected into the earth surrounding the well. This current is concentrated in anomalies of interest, such as the casing of a target well which is to be intercepted by, or to be avoided by, the well being drilled. A sensitive magnetometer is located within a nonmagnetic portion of the drill string, near the bottom thereof, to detect the alternating magnetic field generated by the current flow in the target and to produce output signals corresponding to the detected field. The output from the magnetometer is used to determine the relative locations of the well being drilled and the target.
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