Method and device for extracting stratum echo signals

A technology of echo signal and extraction method, which is applied in measurement device, re-radiation of sound wave, geophysical measurement and other directions, can solve the problems of large error and low precision of formation echo signal

Active Publication Date: 2012-12-19
CHINA NAT OFFSHORE OIL CORP +1
View PDF2 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the defects of relatively l

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
  • Method and device for extracting stratum echo signals
  • Method and device for extracting stratum echo signals
  • Method and device for extracting stratum echo signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0058] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. The embodiments of the present invention and the combinations of the various features in the embodiments are within the protection scope of the present invention on the premise of no conflict.

[0059] Such as figure 1 As shown, the method for extracting formation echo signals in the embodiment of the present invention mainly includes the following steps.

[0060] Step S110, acquiring the original echo signal x(n) of the nuclear magnetic resonance.

[0061] Step S120, the echo original signal x(n) and the sinusoidal signal sin(ω 0 n) and the cosine signal cos(ω 0 n) performing quadrature multiplication respectively to obtain the quadrature component Q(n) and the in-p...

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 and a device for extracting stratum echo signals and overcomes the defects of high error and low precision of extracting stratum echo signals by nuclear magnetic resonance in the prior art. The method includes acquiring an echo original signal of nuclear magnetic resonance; subjecting the echo original signal to orthogonal multiplication operation with a sine signal and a cosine signal which are identical in frequency, and acquiring orthogonal component and cophase component of the echo original signal; subjecting the orthogonal component to wavelet decomposition and wavelet reconstruction, and acquiring an orthogonal output signal; subjecting the cophase component to wavelet decomposition and wavelet reconstruction, and acquiring a cophase output signal; synthesizing the orthogonal output signal and the cophase output signal by means of the digital phase-sensitive wave detection technology, and acquiring an initial phase of the echo signal of nuclear magnetic resonance and an envelope signal amplitude. By the method and the device for extracting stratum echo signals, noise interference in the signals can be efficiently filtered.

Description

technical field [0001] The invention relates to a technology for extracting formation echo signals of a downhole nuclear magnetic resonance logging tool, in particular to a method and device for extracting formation echo signals. Background technique [0002] In the logging process of downhole nuclear magnetic resonance instrument, the echo signal extraction is very difficult because the formation echo signal is very weak. The digital phase-sensitive detector (DPSD) detection algorithm or wavelet extraction algorithm is commonly used in existing nuclear magnetic resonance logging tools to extract the amplitude and phase of the input signal. However, the current extraction method has large errors and low precision, and is easily affected by the interference of external noise to affect the quality of echo signal extraction. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the defects of relatively large error and ...

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
IPC IPC(8): G01V3/32G01V3/38
Inventor 张嘉伟宋公仆薛志波
Owner CHINA NAT OFFSHORE OIL CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap