Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

An automatic adjustment method of dipole sound source for acoustic logging based on segmented linear frequency modulation

A piecewise linear and automatic adjustment technology, which is applied in seismology, measuring devices, geophysical measurements, etc. for logging records, and can solve problems such as inability to compensate, affecting logging quality, and fixing parameters of piecewise linear frequency modulation signals, etc.

Active Publication Date: 2022-04-12
INST OF ACOUSTICS CHINESE ACAD OF SCI
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current research and application, the parameters of the segmental chirp signal are fixed and cannot be adjusted
In the actual logging process, the formation environment changes in real time, and with the change of downhole temperature and pressure, the frequency response of the transducer and other performances will also change accordingly. correct compensation for varying flexural wave excitation intensity curves, which affect log quality

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • An automatic adjustment method of dipole sound source for acoustic logging based on segmented linear frequency modulation
  • An automatic adjustment method of dipole sound source for acoustic logging based on segmented linear frequency modulation
  • An automatic adjustment method of dipole sound source for acoustic logging based on segmented linear frequency modulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0020] figure 1 It is a flow chart of a method for automatically adjusting dipole sound sources in acoustic logging based on segmented linear frequency modulation according to an embodiment of the present invention. like figure 1 As shown, the method includes the following steps:

[0021] Step S110: Transmitting an excitation signal to the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for automatically adjusting a dipole sound source in acoustic logging based on segmental linear frequency modulation. The method includes the following steps: sending an excitation signal to the logging formation, receiving a corresponding echo signal, and extracting the echo signal from the echo signal. The bending wave signal; process the bending wave signal to obtain the corresponding spectrum curve; obtain the three amplitudes under different frequency bands in the spectrum curve; obtain the duration corresponding to the three amplitudes respectively; increase the duration corresponding to the maximum amplitude value, and decrease The duration corresponding to the minimum amplitude value; according to the adjusted three durations, a new excitation signal is determined. Starting from the actual needs of downhole operations, adaptive parameters can be adjusted according to changes in the downhole environment, so as to ensure that the signal adapts to the changing downhole geological environment.

Description

technical field [0001] The invention relates to the field of geophysical well logging, in particular to an automatic adjustment method of a dipole sound source for acoustic logging based on segmented linear frequency modulation. Background technique [0002] In dipole acoustic logging, the low frequency phase velocity of the dipole is close to the formation shear wave velocity, while the high frequency can reflect the shear wave velocity near the borehole wall. Therefore, obtaining signals in a wider frequency band and then extracting broadband dispersion curves can better perform dispersion correction and near-borehole imaging. The excitation intensity of the bending wave excited by the dipole in the wellbore varies with the frequency. Generally speaking, the excitation intensity of the bending wave is relatively high near the Airy phase frequency point, while in the low frequency band (near 2kHz) and high frequency band (8kHz Nearby) is relatively low, especially in the c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/40
CPCG01V1/40G01V2210/12
Inventor 曹雪砷陈浩贺洪斌周吟秋王秀明
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products