Reducing conductive casing effect in transient cased-hole resistivity logging
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United States of America Patent
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May 16, 2017
Grant Date -
Oct 1, 2015
app pub date -
Nov 21, 2012
filing date -
Nov 21, 2012
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Abstract
A first broadband magnetic field is induced at a first transmitter position in a well bore drilled through a formation. A first formation magnetic field induced by the first broadband magnetic field is detected at a first receiver position. A second formation magnetic field induced by the first broadband magnetic field is detected at a second receiver position. A second broadband magnetic field is induced at a second transmitter position in the well bore. A third formation magnetic field induced by the second broadband magnetic field is detected at the first receiver position. A fourth formation magnetic field induced by the second broadband magnetic field is detected at the second receiver position. A formation property is computed using a function of the first, second, third, and fourth formation magnetic fields, wherein the function reduces the effect of a casing on the computation of the formation property.
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