Metal Loss Detection in Any Fluid Type
The METT multifrequency electromagnetic thickness tool uses nondestructive, noncontact induction methods to detect metal loss and changes in casing geometry, regardless of the fluid type inside the casing. The METT tool is typically used to detect large-scale corrosion or splits, and it can also be used to detect metal loss in the outer casing of multiple casing strings.
A coil centered in the borehole generates an alternating magnetic field that interacts with the casing; a second coil measures the phase shift. These electromagnetic measurements, made at multiple frequencies, are related to the casing wall thickness, inside diameter, and permeability or conductivity. Each parameter is averaged around the pipe circumference.
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