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

A logging-while-drilling acoustic logging method and device based on dual-source flyback technology

A kind of technology while drilling, which is applied in the field of sonic logging method and device while drilling, which can solve the problems of drill collar wave interference, etc., and achieve the effects of reducing maintenance costs, avoiding groove design, and avoiding damage

Active Publication Date: 2017-08-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method and device for acoustic logging while drilling based on dual-source flyback technology, so as to solve the interference problem of drill collar waves during single-pole longitudinal wave logging while drilling. The link suppresses the drill collar wave to improve the signal-to-noise ratio of the formation wave, and adopts the data processing method of acoustic wave interferometry in subsequent data processing, thus forming an acoustic logging while drilling technology that does not require sound insulation devices

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
  • A logging-while-drilling acoustic logging method and device based on dual-source flyback technology
  • A logging-while-drilling acoustic logging method and device based on dual-source flyback technology
  • A logging-while-drilling acoustic logging method and device based on dual-source flyback technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] The sonic logging while drilling tool based on dual-source flyback technology such as figure 1 shown. It mainly includes the sound system part and the circuit part (both are embedded in the drill collar). Acoustic part such as figure 1 As shown, it consists of a dual-source transmitting and receiving array. In the figure 1 is the drill collar, 2 and 3 are the remote transmitters T f , near the transmitter T n , are two monopole piezoelectric transducers with the same working performance, which can emit sound waves to the formation under the excitation of the high voltage of the transmitting circuit. 6 is a monopole receiving array composed of N piezoelectric ceramic sensors, which can convert acoustic signals into electrical signals by using the piezoelectric effect of piezoelectric ceramics. The number of receivers N is usually 4 to 16 , 7 is the receiver protection cover, and the main function is to protect the receiving transducer and sound transmission; 8 is th...

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 acoustic logging while drilling based on dual-source flyback technology. The present invention adopts two emission, far and near. When logging, the far emission Tf is first excited, the emission amplitude is A1, the near emission Tn is excited after a delay of a period of time τ, the emission polarity is opposite to Tf, and the amplitude is A2 ; At the same time when the sound source is excited, the signals on N receivers are collected and recorded; the drill collar waves excited by the far and near emission at the position of the receiver arrive at the same time, have opposite polarities and the same amplitude, and are canceled after superposition. , so as to suppress the drill collar wave. In the subsequent data processing, the sonic interference method is used to further suppress the influence of the residual drill collar wave, and the velocity of the formation wave is extracted. Thus, an acoustic logging-while-drilling technology that does not require a sound insulation device is formed. The invention solves the interference problem of the drill collar wave during the monopole longitudinal wave logging while drilling, avoids the damage of the drill collar strength caused by the groove design, and reduces the mechanical processing difficulty and the manufacturing cost of the instrument.

Description

technical field [0001] The invention belongs to the field of geophysical logging, and relates to an acoustic logging method and device while drilling, in particular to an acoustic logging method and device based on dual-source flyback technology. Background technique [0002] Acoustic logging is an important geophysical logging method. Its main purpose is to measure the velocity of compressional and shear waves in the formation, and then evaluate the reservoir parameters such as the porosity of the formation. The Logging While Drilling (LWD) technology has developed rapidly in the past ten years. Because it can complete the logging operation while drilling, it greatly saves the time occupied by the drilling rig, especially in the current increasing offshore oil and gas exploration and development operations. It has a good application prospect. However, as one of the key technologies of logging while drilling, the sonic logging while drilling technology is relatively lagging...

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): E21B47/00E21B49/00
CPCE21B47/00E21B49/00
Inventor 唐晓明张博苏远大
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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