Evaluation tool for concentric wellbore casings
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United States of America Patent
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Feb 7, 2017
Grant Date -
Aug 25, 2016
app pub date -
Jul 10, 2015
filing date -
Jul 11, 2014
priority date (Note) -
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Abstract
A system comprises one or more first electromagnetic coils configured to generate and direct first excitation signals toward a plurality of casings in a wellbore and receive response signals based on the excitation signals. The system also comprises a magnetic field source configured to generate a static magnetic field in a particular casing of the plurality of casings and a magnetometer configured to receive response signals based on the static magnetic field in the particular casing. The system further comprises one or more processors configured to receive a first response signal from the one or more electromagnetic coils, receive a second response signal from the magnetometer, and determine, based on the first response signal and the second response signal, whether a defect exists in the plurality of casings.
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