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Method for detecting leakage of oil gas pipe based on pressure signal knee

A pressure signal, oil and gas pipeline technology, applied in the direction of measuring the increase and decrease rate of the fluid, using the liquid/vacuum degree to measure the liquid tightness, etc., can solve the waste of manpower and material resources, high false alarm rate, leak location accuracy and sensitivity, etc. problem, to achieve the effect of reducing waste, high sensitivity, and saving resources

Inactive Publication Date: 2005-11-09
TIANJIN UNIV
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Problems solved by technology

[0005] The algorithm for obtaining the characteristic inflection point of the pressure signal is currently mainly using the wavelet transform method. Although its leak location accuracy and sensitivity are high, the false alarm rate is also relatively high, which may easily cause unnecessary waste of manpower and material resources.

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  • Method for detecting leakage of oil gas pipe based on pressure signal knee
  • Method for detecting leakage of oil gas pipe based on pressure signal knee
  • Method for detecting leakage of oil gas pipe based on pressure signal knee

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Embodiment Construction

[0043] The following describes the detection process in detail in conjunction with the accompanying drawings:

[0044] The pressure data (20 pieces / s) collected by the data collector is sent to the computer in real time, figure 1 It is the output curve x(k) (1 hour) of the pressure transmitter of the outlet pumping station collected by the data collector when a certain oil and gas pipeline actually leaks. It can be clearly seen that there is a sudden inflection point in the pressure signal waveform. The computer performs the Kalman filter recursive algorithm operation on each pressure data sent in according to (3)-(8) to obtain the corresponding innovation data. figure 2 that is figure 1 The pressure signal waveform corresponding to the innovation sequence e(k), from which we can clearly see figure 1 The extreme value appears at the corresponding position of the inflection point, and its magnitude is much larger than that of the conversion value at the non-inflection point....

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Abstract

The invention discloses an oil gas pipeline leakage detecting method based on pressure signal inflexion that belongs to pipeline monitoring technology. It includes the following steps: collecting the output value list of the entrance and exit of the pipeline from the pumping station pressure transmitter; sending to computer; taking conversion process to make the pressure signal wave mutation inflexion obvious; identifying the moment of the inflexion happening, and gaining time table; then, judging whether the pipeline is leakage. The advantage of the invention are simple, practical, and can effectively decreases the miss alarming rate, increases the location accuracy of leakage. It is suited for detecting the oil gas pipe in normal transferring condition.

Description

technical field [0001] The invention relates to a method for detecting leakage of an oil and gas pipeline based on an inflection point of a pressure signal, which belongs to pipeline monitoring technology. Background technique [0002] The more important the status of the pipeline in the national economy, the more attention is paid to the safe operation of the pipeline. As an important part of pipeline operation monitoring, leak detection technology has been developing continuously. At present, there are many pipeline leakage detection methods. Since pipeline leakage detection is a combination of multi-field and multidisciplinary knowledge, there are great differences in detection methods and technical means among various detection methods. From the simplest manual inspection along the pipeline From land detection to seabed detection, and even using aircraft or satellite remote sensing to detect large-scale pipeline networks. [0003] The negat...

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Application Information

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IPC IPC(8): G01M3/28
Inventor 靳世久朱爱华王立坤崔谦李健
Owner TIANJIN UNIV
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