Remote exploration method for transmitting and receiving dipole transverse waves in well

A technology of long-distance detection and dipole acoustic waves, applied in seismology for logging records, etc., can solve the problems of weak acoustic signals, difficult measurement and processing, etc., and achieve the effects of amplitude enhancement, detection range and effectiveness

Active Publication Date: 2012-06-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0006] The purpose of the present invention is to provide a remote detection method for transmitting and receiving dipole shear waves in the well, so as to solve the problem that

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  • Remote exploration method for transmitting and receiving dipole transverse waves in well
  • Remote exploration method for transmitting and receiving dipole transverse waves in well
  • Remote exploration method for transmitting and receiving dipole transverse waves in well

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Embodiment Construction

[0026] Concrete principle of the present invention is described as follows:

[0027] To understand how this technology works and the importance of working below this cutoff frequency, we first perform a theoretical analysis of the sound field generated by a dipole source located in the well, both in and out of the well. Such as figure 1 As shown, a dipole acoustic source is placed in a fluid-filled wellbore, and the acoustic source generates waves in the well that propagate along the well axis. In the frequency range of several thousand Hertz, such waves generally propagate in the form of bending waves. The displacement potential of fluid fluctuation in the well can be expressed as:

[0028] u f = ▿ Φ f - - - ( 1 )

[0029] While the dipole sound source is working, it also radiates elastic waves to t...

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Abstract

The invention discloses a exploration method for transmitting and receiving dipole transverse waves in a well. The remote exploration method comprises the following steps of: setting a sub dipole sound source in the well; controlling the frequency of a dipole sound wave excited by the sub dipole sound source so as to enable a dipole sound source to transmit the dipole sound wave in the well below a bending wave cut-off frequency; filtering received waveform signals of a direct wave in the well and a reflected wave outside the well through a filter; adjusting the signals through programmable gain controlled by a micro-processor and a receiving control system to an amplitude suitable for a subsequent analogue/digital converter; after digitally sampling the signals through the analogue/digital converter, transmitting the signals to the micro-processor; and storing digitized data by the processor and transmitting the digitized data to a ground acquisition system. The technical problem of difficulty in measurement and processing because sound wave signals of a receiver reflected to the well are very weak in the traditional dipole transverse wave method can be solved by the method disclosed by the invention.

Description

technical field [0001] The invention belongs to the application of geophysical well logging technology, specifically, the invention is a method and technology for transmitting and receiving acoustic waves / elastic waves in wells to detect geological structures or abnormal bodies in formations around wells. Background technique [0002] With the increasing demand for exploration and development of oil, natural gas and mineral deposits and the development of logging technology, it is necessary to detect stratum structures and geological bodies within the range of several meters to tens of meters around the well. Specific examples of these structures or geological bodies include stratum boundaries, fractures, faults, caves, ore bodies, and the like. The measurement technology of these structural geological bodies in the well is called the remote detection technology. It increases the measurement range of conventional logging technology from about one meter around the well to te...

Claims

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Application Information

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IPC IPC(8): G01V1/40G01V1/44
Inventor 唐晓明苏远大魏周拓谭宝海
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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