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Acoustic logging transmitting transducer driving system

A technology for transmitting transducers and driving systems, which is applied in measurement, wellbore/well components, earthwork drilling and production, etc. It can solve the problems that users cannot control the frequency of sound sources, and achieve the effect of improving the applicability of the formation and reducing the frequency

Inactive Publication Date: 2015-02-25
THE 22ND RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the transmitting transducer of the acoustic logging tool is usually excited by a high-voltage rectangular pulse of a certain width, and the user cannot control the frequency of the sound source according to the needs of engineering or scientific research.

Method used

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  • Acoustic logging transmitting transducer driving system
  • Acoustic logging transmitting transducer driving system
  • Acoustic logging transmitting transducer driving system

Examples

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Embodiment 1

[0015] Example 1: as figure 1 The shown acoustic logging launch transducer drive system is mainly composed of a ground waveform design module, a waveform generation module, a power amplification module and a launch transducer. It is used to drive the transmitting transducer of the acoustic logging tool. The purpose is to radiate acoustic waves to the formation by controlling the excitation transmitting transducer. More specifically, it is used to measure the sound source characteristics (frequency band, amplitude, etc.) control. Among them, the driving method of the transmitting transducer is suitable for the excitation of the transmitting transducer of various acoustic logging tools such as monopole, dipole and quadrupole. devices (etc.) are adaptable.

[0016] figure 1 The functions of each part are described as follows:

[0017] Surface waveform design module: The user selects or designs waveform data (or control commands) with different frequency bands with the surface...

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Abstract

The invention relates to an acoustic logging transmitting transducer driving system, which comprises a ground waveform design module, a waveform generation module, a power amplification module and a transmitting transducer. A user selects or designs waveform data with different frequency bands or a control instruction according to the needs by using a ground instrument and transmits the data or construction to an underground control unit of an acoustic logging instrument through telemetry cartridge; and the underground control unit controls a digital / analog (D / A) converter to generate low-voltage analog waveform, performs signal conditioning through a filtering circuit and an amplification circuit, outputs Signal waveform, performs power amplification on the Signal waveform by utilizing a power amplification circuit and finally applies the Signal waveform to the transmitting transducer so as to radiate acoustic waves outwards. The acoustic logging transmitting transducer driving system has the advantages that the impulse waveform of a transmitting circuit can be designed on the ground, more favorable excitation waveforms are selected according to the geological conditions and logging needs, and better logging data is acquired; and moreover, the formation applicability of an acoustic logging instrument is improved.

Description

technical field [0001] The invention relates to the technical field of acoustic logging, in particular to an acoustic logging transmitting transducer drive system. Background technique [0002] Acoustic logging is one of the main methods of geophysical logging, which is widely used in the exploration and development of oil and gas fields. Theoretical and experimental studies show that the characteristics of the sound source frequency band have a great influence on the logging effect, and appropriate sound source frequency bands should be used for different logging purposes and geological conditions. For example: for monopole sonic logging, a higher sound source frequency is usually required in order to highlight the longitudinal and shear waves; if you want to obtain better Stoneley waves, you need to work in low-frequency mode; for cased well cementing quality logging For example, the main frequency of the sound source is usually set at about 20kHz; for dipole shear wave l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/14E21B49/00
Inventor 张博王军杰王武营成思周祥熹邓方青刘峰常平平殷谦乔喜梅
Owner THE 22ND RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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