A method for measuring dynamic liquid level in oil wells based on normalized convolution and adaptive filtering

An adaptive filtering and normalization technology, applied in surveying, earth-moving drilling, wellbore/well components, etc., can solve the difficulty in realizing automatic calculation of dynamic fluid level value, difficulty in realizing dynamic fluid level measurement, and difficulty in resonating harmonic signals. and other problems, to improve the measurement accuracy and measurement range, the filtering effect is stable and reliable, and the effect of automatic calculation is achieved.

Active Publication Date: 2022-06-21
CHONGQING UNIV OF POSTS & TELECOMM
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  • Application Information

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Problems solved by technology

However, when excited by noise, the collected signal also contains a large number of noise signals. Under the action of strong noise, useful signals are submerged, making it difficult to extract resonance harmonic signals by this measurement method, and it is difficult to achieve a wider range of oil well dynamics. It is also difficult to realize the automatic calculation of the dynamic liquid face value

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  • A method for measuring dynamic liquid level in oil wells based on normalized convolution and adaptive filtering
  • A method for measuring dynamic liquid level in oil wells based on normalized convolution and adaptive filtering
  • A method for measuring dynamic liquid level in oil wells based on normalized convolution and adaptive filtering

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Embodiment 1

[0066] In this embodiment, the above steps are further described.

[0067] Install detection devices such as figure 2 , the loudspeaker 3 is installed at the pipe mouth, the acoustic sensor 1 is installed at the front end of the loudspeaker, and the distance from the loudspeaker 3 is 40cm, and the acoustic sensor 1 and the loudspeaker 3 are both flush with the axis of the casing 2, the experimental pipe diameter d=406mm, the actual pipe The length is 806.92m, and the end of the pipe is rigidly closed.

[0068] Set the signal sampling frequency f s = 2048Hz, sampling time t 1 =120s, the experimental environment temperature T=20℃. The acoustic sensor 1 collects the resonance signal of the air column, and the time domain signal is such as image 3 As shown, the useful signal is completely drowned out by the low frequency noise emitted by the loudspeaker 3 .

[0069] For the signal x(n) collected by the acoustic sensor 1, different segment numbers are selected for power spec...

Embodiment 2

[0087] In engineering applications, it is also a common requirement to reduce the amount of calculation data, reduce the hardware cost, and improve the calculation efficiency. This embodiment will compare the measurement time. Set the signal sampling frequency f s = 2048Hz, sampling time t 2 = 40s, the experimental environment temperature T = 20 ℃, the time domain signal such as Figure 12 shown;

[0088] The processing steps of the traditional algorithm are the same as those of the traditional signal x(n) collected by the acoustic sensor (1) in Embodiment 1. The process of using the traditional algorithm to process is the same. The STFT three-dimensional spectrum analysis is performed on the high-pass filtered signal. Figure 13 It can be seen that when the length of the available calculation data is reduced, there is no frequency distribution with strong energy in the three-dimensional spectrum, and the resonance harmonic frequency band is completely submerged by the noise...

Embodiment 3

[0094] This embodiment proposes an oil well dynamic liquid level measurement device based on normalized convolution and adaptive filtering, including a data acquisition module, an adaptive filtering processing module, a resonance frequency band confirmation module, and an oil well liquid level calculation module, wherein:

[0095] The data acquisition module includes a loudspeaker and an acoustic sensor, the loudspeaker is installed at the casing opening, the acoustic sensor is installed near the loudspeaker, and both the acoustic sensor and the loudspeaker are flush with the casing axis;

[0096] The loudspeaker is used to emit low-frequency noise to excite the air column in the pipe;

[0097] The acoustic sensor is used to collect the mixed signal of the noise emitted by the loudspeaker and the resonance of the air column;

[0098] The adaptive filtering processing module includes a Welch-based signal selection module, a signal conversion module and a spectral subtraction mo...

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Abstract

The invention belongs to the field of oil well dynamic liquid level depth measurement, and in particular relates to a method for measuring oil well dynamic liquid level based on normalized convolution and self-adaptive filtering, comprising: collecting signals, and using Welch to select two groups with different lengths Data, the low-frequency band signal is intercepted by the spectrum subtraction operation of the frequency signal of the two sections of data; the resonance frequency band is determined according to the intercepted signal, and the number of resonance harmonic fluctuations in the resonance frequency band is obtained, and the oil well liquid level depth is calculated; the present invention is compared with the traditional algorithm The disadvantage of manual selection of the resonance harmonic frequency band is realized, the automatic selection of the distribution frequency band of the resonance harmonic signal is realized, and the automatic calculation of the depth of the dynamic liquid surface is further realized, and the signal is processed by convolution filtering, which effectively improves the resonance harmonic signal. SNR.

Description

technical field [0001] The invention belongs to the field of oil well dynamic liquid level depth measurement, in particular to an oil well dynamic liquid level measurement method based on normalized convolution and adaptive filtering. Background technique [0002] In the field of oil exploitation, the dynamic liquid level depth of oil wells, as a key technical parameter of oil well operations, is the main indicator reflecting the liquid supply capacity of the formation and an important basis for evaluating the working status of oil wells. Accurately measuring the position of the dynamic liquid level of the oil well can reasonably control the subsidence depth of the oil well pump. On the one hand, it can prevent ineffective operation due to insufficient subsidence depth, and on the other hand, it can avoid the increase of operating burden and energy consumption due to excessive submergence depth, which in turn affects Equipment performance and service life. Therefore, it is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/00E21B47/047
Inventor 李海青冉超罗久飞冯松李锐杨平安张彬郑凯李靖
Owner CHONGQING UNIV OF POSTS & TELECOMM
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