Device and method for detecting oil well dynamic liquid level depth based on audio-acoustic wave electro-acoustic system

Abstract

The invention discloses a device and a method for detecting a working fluid level depth of an oil well based on an audio frequency sound wave electroacoustic system. The device comprises a signal conditioning system arranged on the ground, a standard sound source, a multichannel high-power D class digital power amplifier, a first electroacoustic device, a second electroacoustic device, a sound-wave combined waveguide pipe and a wellhead sound wave receiver, wherein a two-path or multi-path audio frequency signal is generated by the standard sound source; the two-path or multi-path audio frequency signal is amplified through the power amplifier and then is fed into each electroacoustic device, so that an audio frequency sound-wave signal is generated; the audio frequency sound-wave signal is coupled and then is fed into the well; after the signal is reflected by the working fluid level of the oil well, the time difference between the echo signal and the fed-in sound-wave signal is measured and then the depth of the working fluid level depth of the oil well is calculated. According to the invention, the theoretically limitlessly amplifying the sound wave power can be realized through the sound wave coupling tube, and meanwhile, the adopting frequency can be dynamically changed according to the underground voice frequency characteristics, so that the system can adapt to various application conditions of different depths and well conditions.

Description

technical field [0001] The invention discloses a device and a method for detecting the depth of an oil well dynamic liquid level based on an audio frequency, acoustic wave, and electroacoustic system. Background technique [0002] There are many methods for detecting the depth of fluid level in oil wells, the most commonly used methods are echo method, buoy method and pressure gauge detection method. The disadvantage of the echo method is that it is easily affected by the foam section in the oil casing, which increases the calculation error of the liquid level; because the buoy method cannot be tested under pressure, it is generally used in the annulus without pressure in the annular space of the oil casing and the operation well with an open wellhead; Although the pressure gauge detection method is applicable to all oil and water wells, the operation is complicated, the construction period is long, and it is very important to select a suitable hovering point, which requires...

AI Technical Summary

Problems solved by technology

The audio-frequency sound wave device and method adopted in the present invention can solve a series of problems existing in the oil well dynamic liquid level measurement device based on infrasonic waves in the past, such as: difficult design of infrasonic wave source, difficulty in wellhead coupling, serious formation layer sound wave interference, etc.

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