Environmental Engineering Reference
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induced in the receiver coil will be out of phase with the transmitted signal. In general,
the phase difference is controlled by the thickness of the casing wall. The raw log
measurement is one of phase lag in degrees and the log is scaled in degrees.
Fig. 13.6
Electromagnetic thickness tool
Figure 13.7 illustrates a modern tool that is tuned to allow measurement of the
thickness of a casing string even while the tool itself is inside tubing.
Fig. 13.7 Casing corrosion detected from tool inside tubing. Courtesy TGT ®
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