公开(公告)号：US20180372902A1

公开(公告)日：2018-12-27

申请号：US15632024

申请日：2017-06-23

Applicant: BAKER HUGHES INCORPORATED

Inventor： Wei Han ,  Jason M. Harris ,  Douglas J. Patterson ,  Stephen Dymmock ,  John Dahl

IPC: G01V1/50

Abstract: Methods and apparatus for performing formation evaluation in a borehole intersecting an earth formation. Methods may include exciting at a first borehole depth at least one critical refraction wave by steering an acoustic beam transmitted by at least one ultrasonic transmitter to an interface in the formation to intercept the interface at a critical angle; receiving an acoustic signal comprising critical refraction wave data at a logging tool in the borehole; and obtaining a wave property measurement from the critical refraction wave data. The interface may be the borehole wall in an open-hole well or behind casing. Methods include using ultrasonic transmitter(s) to generate the plurality of acoustic beams, identifying critical refraction wave data within the response signal corresponding to the at least one critical refraction wave, and obtaining the wave property measurement from the critical refraction wave data.

公开(公告)号：US08913461B2

公开(公告)日：2014-12-16

申请号：US14109553

申请日：2013-12-17

Applicant: Baker Hughes Incorporated

Inventor： Roger R. Steinsiek ,  Jason M. Harris ,  Jinsong Zhao ,  Douglas J. Patterson ,  James B. Domnanish

IPC: G01V1/00

CPC classification number: G01V1/345 ,  B06B1/0622 ,  G01V1/40 ,  G01V1/48

Abstract: Measurements made by a transducer assembly for downhole imaging are affected by reverberations between the transducer and the window on the outside of the assembly. The reverberations result in a stationary noise on the image. Hardware solutions to improve signal-to-noise ratio includes using a composite transducer, adjusting the distance between the transducer and the window. SNR can also be improved by processing techniques that include stacking, fitting a sinusoid to the reverberation, by envelope peak detection, and by applying a notch filter.

Abstract translation: 用于井下成像的换能器组件进行的测量受到传感器与组件外部的窗口之间的混响的影响。 混响导致图像上的静止噪声。 提高信噪比的硬件解决方案包括使用复合传感器，调整传感器和窗口之间的距离。 还可以通过包括堆叠，将正弦曲线拟合到混响，通过包络峰值检测以及通过应用陷波滤波器的处理技术来改善SNR。