Leakage detecting and locating method based on pressure and sound wave information amalgamation

Abstract

A leakage detection location method based on pressure and sound information integration is provided, which belongs to the technology field of an oil (gas) pipeline fault diagnosis, and is characterized by leakage detection and leakage location based on information integration. The former comprises: separately acquiring the measurement data of the pressure on the upperstream end and downstream end of the pipeline and a sound wave sensor, sending the data to a computer and gaining final detection results through three levels processing including data filtering, characteristic level integration and decision level integration. If the detection result shows leakage, starting leakage location process based on information integration. The process first carries out leakage location by separately adopting the signals of two kinds of sensors and a plurality of different leakage location algorithms and finally gains the location results via integration of the location results based on the same sensor and different location methods and two levels processing based on the integration of the location results of two kinds of different sensors. The method can effectively reduce the false positive rate and false negative rate and improve the location precision.

Description

technical field [0001] A leak detection and positioning method based on fusion of pressure and acoustic wave information belongs to the technical field of oil (gas) pipeline fault diagnosis. Background technique [0002] Pipeline transportation is an important mode of modern industrial fluid transportation. Compared with other transportation methods, it has many advantages such as economy, convenience, high efficiency, safety and easy management. Therefore, it is widely used in oil and natural gas transportation. Due to various reasons, the pipeline will leak during operation, which not only causes huge resource loss and economic loss, but also may cause serious environmental pollution problems and bring huge economic losses to the country. Therefore, timely detection of pipeline leakage and leak location, It is very necessary to ensure the safe operation of the pipeline. [0003] The existing leak detection and location methods can be roughly divided into the following thr...

AI Technical Summary

Problems solved by technology

[0004] One is the in-pipe detection method that realizes leak detection and location by detecting the integrity of the pipe wall, mainly relying on technologies such as magnetic flux, eddy current, and camera. Very prone to accidents such as pipe blockage

[0005] The second type is the out-of-pipe detection method that realizes leak detection and location by directly detecting the presence of leaking substances, mainly including distributed optical fibers, special cables, radar, infrared, laser imaging, etc. This type of method has a large investment or is not real-time specialty

However, the negative pressure wave method also has some obvious disadvantages, including poor sensitivity and positioning accuracy for small and slow leaks, poor ability to overcome disturbances at the operating station, high false alarm rate, and difficulty in effectively detecting continuous leaks, etc.

The method based on acoustic signal analysis also belongs to the third category. It has the characteristics of high sensitivity and can significantly improve the detection ability of small leaks, slow leaks and long-distance pipeline leaks. It has a better ability to overcome disturbances, but because the acoustic signal does not contain a DC component, the signal and the actual working condition lack an intuitive correspondence. Once a false alarm occurs, it is difficult to further judge the alarm result through manual verification.

[0008] From the previous analysis, it can be seen that using a single sensor, due to the limitations of the sensor itself, there are many problems in the engineering application of the leak detection system.

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