Oil pipeline leakage detection and positioning method based on comprehensive signals

Abstract

The invention discloses an oil pipeline leakage detection and positioning method based on comprehensive signals. The method oil pipeline leakage detection and positioning method based on comprehensive signals can solve the problems that a single pressure signal is limited by pipeline tail end devices and can hardly detect the pressure inflection point and under the conditions of small leakage and slow leakage, inflection point features of the pressure signal are not prominent in a negative wave pressure method. According to the technical scheme, pressure signals and flow signals in the leakage transient process are combined into new comprehensive signals and variation of the comprehensive signals is monitored. Whether leakage exists or not is judged according to existence of abnormities and leakage position calculation is carried out by recognizing the comprehensive signals. Compared with the negative wave method, limitation by devices at the two ends of the pipeline does not exist and the oil pipeline leakage detection and positioning method is especially suitable for working conditions that oil tanks are arranged at the tail ends of the pipeline and the like. As the comprehensive signals are adopted, the inflection point features of the leakage signal can be effectively highlighted and the oil pipeline leakage detection and positioning method is also suitable for detection and positioning of small leakage and slow leakage.

Description

technical field [0001] The invention relates to a method for detecting and locating oil pipeline leakage based on integrated signals. Background technique [0002] Oil pipeline is an important way of oil transportation in our country, so oil pipeline leakage detection and location has always been a technical problem in history. Pipeline leak detection and location methods are roughly divided into four categories. The first category is based on manual inspection methods. This type of method has the characteristics of high positioning accuracy and low false alarm rate, but it cannot detect leaks in time, and the detection can only be carried out intermittently. The second type is the in-pipe leak detection method based on ultrasonic, magnetic flux, camera and other technologies. This type of method has high positioning accuracy and low false alarm rate, but cannot realize online detection. Because the detection ball drifts with the medium in the pipe, it is prone to blockage ...

AI Technical Summary

Problems solved by technology

[0004] The existing negative pressure wave method only locates the leak according to the pressure change at both ends of the pipeline. Although the flow signal is also detected on the pipeline, it is only used as the basis for the leakage alarm and does not perform location.

The pressure change is related to the equipment at both ends of the pipeline. In extreme cases, such as when the end of the pipeline is an oil tank, the pressure at the end of the pipeline is always fixed at the pressure in the oil tank, and the negative pressure wave caused by the leakage cannot be displayed at all.

In addition, for small leaks and slow releases, the pressure inflection point is not obvious and difficult to identify

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