Method and system for eliminating direct wave interference in acoustic logging, and acoustic logging instrument

A sonic logging tool and direct wave technology, applied in boreholes/well components, measurement, earthwork drilling and production, etc., can solve problems such as violent jumping of logging curves, difficulty in finding the first wave, and inaccurate measurement

Inactive Publication Date: 2013-11-13
CNPC GREATWALL DRILLING ENG
View PDF5 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that once the stratum changes drastically, the amplitude of the first wave will fluctuate violently due to the great difference in the attenuation effect of the stratum with different properties on the amplitude of the sound wave, and for the softer stratum, the noise and the ampl

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 system for eliminating direct wave interference in acoustic logging, and acoustic logging instrument
  • Method and system for eliminating direct wave interference in acoustic logging, and acoustic logging instrument
  • Method and system for eliminating direct wave interference in acoustic logging, and acoustic logging instrument

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0069] combine first Figure 4 The time-slowness-correlation coefficient (STC) method used in the present invention is introduced. The main principle of the STC method is to use the characteristic that the wave forms of the same mode wave in the array acoustic logging signal are similar in shape to calculate the mode wave slowness. Such as Figure 4 As shown in the schematic diagram of the STC operation, when performing the STC operation, starting from the selected time T, a certain length of time window T is used W The array acoustic logging waveform signal is scanned in the time domain and the slowness domain, and the correlation coefficients are calculated respectively. The larger the correlation coefficient, the greater the possibility that the corresponding time window is the waveform of the same mode wave. The slowness of each formation mode wave can be obtained by performing a peak search on the time-slowness-correlation coefficient spectrum. The position of the win...

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 relates to a method and a system for eliminating direct wave interference in acoustic logging, and an acoustic logging instrument. A transmitting transducer of the acoustic logging instrument transmits logging acoustic waves to two or more receiving transducers; the receiving transducers receive the logging acoustic waves; as for each receiving transducer, the time and slowness related coefficient of the logging acoustic waves is solved out by virtue of scanning in a time domain and a slowness domain, so that a time and slowness related coefficient spectrum is formed; the time and slowness related coefficient spectrum is researched; by virtue of researching a peak value, the slowness of each mode wave of a stratum is determined; the time that each mode wave arrives at the receiving transducers is determined according to the slowness, so that logging analysis data can be provided, wherein the consistency of direct waves received by each receiving transducer is damaged, and the correlation coefficient of the direct waves is reduced, so that the reality and accuracy of useful logging data are realized.

Description

technical field [0001] The present invention relates to a method and system for eliminating direct wave interference in sonic logging performed with a sonic logging tool in which logging is transmitted from a transmitting transducer of the sonic logging tool to two or more receiving transducers Acoustic wave, collecting the well logging sound wave through the receiving transducer, for each receiving transducer, the time slowness correlation coefficient of the well logging sound wave is calculated by scanning in the time domain and the slowness domain, thus The time-slowness correlation coefficient spectrum is formed, the time-slowness correlation coefficient spectrum is searched, the slowness of each mode wave in the formation is determined through peak search, and the oil reservoir and geological characteristics are determined according to the slowness. In addition, the present invention also relates to a corresponding sonic logging tool applied to the method and system. Ba...

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): E21B47/18E21B49/00E21B47/00
Inventor 鲍雪山肖加奇白庆杰
Owner CNPC GREATWALL DRILLING ENG
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