公开(公告)号：US09746574B2

公开(公告)日：2017-08-29

申请号：US15003630

申请日：2016-01-21

Applicant: BAKER HUGHES INCORPORATED

Inventor： Gregory B. Itskovich ,  Stanislav Forgang ,  Sven Krueger ,  Fei Le

IPC: G01V3/26 ,  E21B49/00

CPC classification number: G01V3/26 ,  E21B49/00 ,  G01V3/18 ,  G01V3/24

Abstract: Methods and apparatus configured to evaluate a volume of interest of an earth formation intersected by a borehole. Apparatus comprise a transceiver electrode on the tool body configured to provide electrical current to the earth formation; a return electrode configured to receive the electrical current returning from the earth formation; a multi-function electrode on the resistivity imager tool; and an electrical system configured to provide current measurements at the transceiver electrode. In the first operational mode, the electrical system maintains the tool body at a first electrical potential, and maintains the multi-function electrode and the transceiver electrode at a second electrical potential; and in the second operational mode, the electrical system maintains the tool body at the first electrical potential, maintains the multi-function electrode at the first electrical potential, and maintains the transceiver electrode at the second potential.

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.