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|1. (WO2018068003) IMPROVED DOWNHOLE ELECTROMAGNETIC ACOUSTIC TRANSDUCER SENSORS|
|Applicants:||BAKER HUGHES, A GE COMPANY, LLC
MATUSZYK, Pawel, J.
RAMIREZ, Marc, S.
FANINI, Otto, N.
PATTERSON, Douglas, J.
|Title:||IMPROVED DOWNHOLE ELECTROMAGNETIC ACOUSTIC TRANSDUCER SENSORS|
Systems, devices, and methods for estimating a value of a downhole parameter of interest. Aspects include an apparatus for evaluating a tubular. The apparatus may include a sensor including an electromagnetic acoustic transducer (EMAT) device configured to be conveyed into the tubular. The EMAT device may include measurement circuitry comprising at least one conductive coil; and a magnet array comprising magnets arranged with a corresponding direction of magnetization of each magnet oriented according to a configuration producing a greater magnetic flux on a first side of the array than on a second side opposing the first side. The magnetic flux produced from the second side may be substantially zero. In embodiments, the configuration of magnets comprises at least a first set of permanent magnets in a linear Halbach configuration.