公开(公告)号：US10436018B2

公开(公告)日：2019-10-08

申请号：US15288092

申请日：2016-10-07

Applicant: BAKER HUGHES INCORPORATED

Inventor： Babak Kouchmeshky ,  Xiaochu Yao ,  Stanislav Forgang ,  Pawel J. Matuszyk ,  Marc S. Ramirez ,  Otto N. Fanini ,  Douglas J. Patterson ,  Vimal Shah

IPC: G01N29/24 ,  G01N29/34 ,  E21B47/09 ,  G01V1/52 ,  B06B1/04 ,  E21B47/16 ,  G01N29/28

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.