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The Baker Hughes Digital Magnelog™ (DMAG™) service is an electromagnetic multifrequency, multispacing casing inspection service to detect wall thickness changes in single or multiple casing strings.
The casing wall thickness is determined by the amount of magnetic field shift, which is affected by casing thickness and permeability. An electronic caliper measures the magnetic permeability of the void between the tool and the inner wall of the casing, indicating average inside diameter. A differential anomaly indicator provides a curve which displays small defects on the inside wall of the casing.