Methods of deep azimuthal inspection of wellbore pipes
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United States of America Patent
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Dec 6, 2016
Grant Date -
Jun 9, 2016
app pub date -
Jun 25, 2015
filing date -
Jul 11, 2014
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Abstract
Methods including conveying a pipe inspection tool into a wellbore having at least a first pipe positioned within a second pipe, the pipe inspection tool including an electromagnetic sensor. A first excitation signal is transmitted from a first x-coil of the electromagnetic sensor, and a first response signal derived from the first excitation signal is received at the first x-coil or a second x-coil of the electromagnetic sensor. A second excitation signal is then transmitted from a first y-coil of the electromagnetic sensor, and a second response signal derived from the second excitation signal is received at the first y-coil or a second y-coil of the electromagnetic sensor. The first and second response signals are then compared to determine an azimuthal characteristic of the second pipe.
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