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

Slowness measurement method for stoneley wave of well hole

A measurement method and low-pass filtering technology, applied in the field of eliminating reflected Stoneley waves, can solve problems such as poor slowness estimation accuracy, and achieve the effect of improving accuracy and eliminating reflected Stoneley waves

Inactive Publication Date: 2014-06-11
CNPC GREATWALL DRILLING ENG
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, after separating the direct Stoneley wave and the reflected Stoneley wave, only the acquired reflected Stoneley wave is used to evaluate formation fractures
In addition, in the existing methods of slowness estimation using Stoneley waves, Stoneley waves with reflected wave interference are still used when calculating the Stoneley wave slowness, so there is a problem of poor estimation accuracy of the slowness question

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
  • Slowness measurement method for stoneley wave of well hole
  • Slowness measurement method for stoneley wave of well hole
  • Slowness measurement method for stoneley wave of well hole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] figure 1 It is a diagram showing the measurement principle of a monopole acoustic wave instrument. The Stoneley waves generated by the transmitter T propagate along the wellbore axis and are sequentially received by eight receivers (R1, R2, ..., R8). Borehole size, changes in formation parameters and fractures will all cause the reflection of Stoneley waves. The downward arrows in the figure represent the reverse propagating Stoneley waves, and the upward arrows represent the forward propagating Stoneley waves.

[0025] figure 2 For example, when the distance between the receiver and the transmitter is 12ft (feet), the simulated waveform data received by the receiver R1 when the tool moves along the wellbore, from which the reflected waves can be seen intuitively, due to the interference of these reflected waves , thus af...

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

This invention discloses a slowness measurement method for stoneley waves of well holes. In a monopole acoustic logging instrument, the reflection phenomenon of the stoneley wave is very obvious because of the size change of the well hole and the parameter change of the crack and the stratum. Theses reflection waves are influences for the extraction of the slowness of the stoneley waves, and thus relative big errors could be caused. This slowness measurement method for stoneley waves of well holes performs wave filtration on array wave shape so as to eliminate reflection stoneley wave, reduce slowness measurement errors and improve measurement precision.

Description

technical field [0001] The invention relates to a method for measuring the slowness of the Stoneley wave in a borehole, in particular to a method for eliminating the reflected Stoneley wave and improving the accuracy of the Stoneley wave slowness measurement. Background technique [0002] In the sonic logging of oil and gas exploration, it is of great significance to measure the velocity of sound waves in the formation. Stoneley waves are often used in the measurement of formation acoustic waves, and Stoneley waves are waves propagating on the interface of half-space bodies of two different media. Since the Stoneley wave propagates in the well and is very sensitive to the condition of the wellbore interface, the Stoneley wave can be used to effectively identify open fractures, formation permeability, etc. [0003] At present, the commonly used way to measure the Stoneley wave velocity is to use a monopole transducer to emit sound waves, use 8 or more acoustic transducers to...

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): G01V7/00G01H17/00
Inventor 伍东郭玉庆鲁萌黄大鹏李响刘超张玉霞仵燕李斐赵东和志明樊春华毛传芳
Owner CNPC GREATWALL DRILLING ENG
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

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com