公开(公告)号：US20180100387A1

公开(公告)日：2018-04-12

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

CPC classification number: E21B47/091 ,  B06B1/04 ,  B06B1/045 ,  E21B47/16 ,  G01N29/2412 ,  G01N29/28 ,  G01N29/34 ,  G01N2291/0421 ,  G01N2291/0422 ,  G01N2291/0423 ,  G01N2291/0427 ,  G01V1/52

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.