Piezoelectric transducer downhole liquid level measuring instrument

A piezoelectric transducer and liquid level measurement technology, which is applied in liquid/fluid solid measurement, measuring devices, instruments, etc., can solve the problems of expensive equipment and few products, and achieve the effect of simple structure and accurate measurement

Inactive Publication Date: 2013-04-24
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Measuring the position of the liquid level in a cased well with a piezoelectric transdu...

Method used

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  • Piezoelectric transducer downhole liquid level measuring instrument
  • Piezoelectric transducer downhole liquid level measuring instrument
  • Piezoelectric transducer downhole liquid level measuring instrument

Examples

Experimental program
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Embodiment Construction

[0022] Send a sine wave to the piezoelectric transducer in the downhole probe through the cable on the ground, and measure the peak voltage at both ends of the probe, the peak current flowing through the probe and the phase difference between the two to indicate the state of the probe during the downhole process, that is, the probe Either in liquid or in air. The location where the state changes is the fluid level in the cased well.

[0023] This system mainly includes four parts: frequency adjustable signal generation part, power amplification part, peak detection part and phase difference detection part. The frequency-adjustable signal generation part takes the ICL8038 integrated chip as the core to generate frequency-adjustable sine waves. The frequency range is 10Hz-50kHz, and the bandwidth can cover the working frequency of most piezoelectric transducers. After the sine wave passes through the power amplification part, the amplitude and power are both amplified, and the ...

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Abstract

The invention relates to a downhole liquid level measuring device applied to oil exploitation operation process. A simple and easy system which integrates signal generation, acquisition and analysis is provided so as to directly utilize a high-power ultrasonic probe. The technical scheme includes that a piezoelectric transducer downhole liquid level measuring instrument comprises a probe portion, a tunable frequency sinusoidal signal generating portion, a power amplification portion, a peak value detection portion and a phase difference detection portion, a tunable frequency sinusoidal wave generated by the tunable frequency signal generating portion is subjected to amplitude and power amplification, an ultrasonic signal subjected to power amplification is transmitted to a probe through a cable, the impedance of a piezoelectric transducer in the probe is changed, changed peak values of voltage and current signals are obtained through the peak value detection portion, the phase difference between the voltage and current signals is detected through the phase difference detection portion, and cased well liquid level positions are indicated through abrupt change of the phase difference. The piezoelectric transducer downhole liquid level measuring instrument is mainly applied to measurement of downhole liquid levels.

Description

technical field [0001] The invention relates to a measuring device for downhole liquid level used in the process of oil exploitation, in particular to a downhole liquid level measuring instrument with a piezoelectric transducer. Background technique [0002] When the piezoelectric transducer is in the air and in the liquid, its radiation load is very different, that is, the resonance frequency, impedance value, and admittance circle of the transducer are significantly different. High-power ultrasonic probes made of multiple piezoelectric transducers are often used in oil well operations to dredge the blockages in the formation and improve the permeability of the formation. When these probes go downhole, technicians hope that the depth and formation where the probes are located can be dynamically known through instruments and equipment, and the position of the liquid level in the cased hole can also be measured. The downhole liquid level measurement system was invented by us...

Claims

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Application Information

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IPC IPC(8): G01F23/296
Inventor 沈建国周翔
Owner TIANJIN UNIV
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