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1. (WO2018068003) IMPROVED DOWNHOLE ELECTROMAGNETIC ACOUSTIC TRANSDUCER SENSORS

Pub. No.:    WO/2018/068003    International Application No.:    PCT/US2017/055639
Publication Date: Fri Apr 13 01:59:59 CEST 2018 International Filing Date: Sat Oct 07 01:59:59 CEST 2017
IPC: G01N 27/90
G01N 27/82
Applicants: BAKER HUGHES, A GE COMPANY, LLC
Inventors: KOUCHMESHKY, Babak
YAO, Xiaochu
FORGANG, Stanislav
MATUSZYK, Pawel, J.
RAMIREZ, Marc, S.
FANINI, Otto, N.
PATTERSON, Douglas, J.
SHAH, Vimal
Title: IMPROVED DOWNHOLE ELECTROMAGNETIC ACOUSTIC TRANSDUCER SENSORS
Abstract:
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.