The Magnetic Thickness Tool (MTT), when run in combination with the multi-finger caliper, provides a comprehensive profile – both internal and external – of casing or tubing.
The MTT measures variations in casing and tubing metal thickness using the propagation of electro-magnetic energy. Sensors are mounted on bowstrings to provide full coverage around the well bore, as well as flexibility through well-bore restrictions.
An alternating magnetic wave emitted from the tool permeates through the well fluid to the casing before passing along the casing to the tool sensors mounted on bowsprings. The velocity and amplitude of the received signal is impacted by the metal thickness.