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Optical fiber sensor-based natural gas pipeline leakage monitoring method and system and installation method for system

A technology of natural gas pipeline and monitoring system, applied in the field of natural gas pipeline leakage monitoring system, can solve the problems of high false alarm rate, easy to be affected by environmental factors, low sensitivity and the like

Active Publication Date: 2013-03-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Claims
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AI Technical Summary

Problems solved by technology

[0012] In view of the problems of low sensitivity, high false alarm rate, and susceptibility to environmental factors in the above-mentioned types of leak detection and monitoring technologies, the present invention provides a high-sensitivity quasi-distributed leak vibration monitoring system based on optical fiber sensing. Sensitivity sensors make it possible to detect in time the primary stage of leakage such as microleakage and seepage in the pipeline, and combine the time domain and frequency domain characteristics of leakage events to effectively reduce the false alarm rate of the system caused by interference. This technical solution overcomes the The poor accuracy of the previous monitoring technology and the lack of complex installation process enable relevant maintenance personnel to take timely countermeasures to avoid causing greater security incidents

Method used

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  • Optical fiber sensor-based natural gas pipeline leakage monitoring method and system and installation method for system
  • Optical fiber sensor-based natural gas pipeline leakage monitoring method and system and installation method for system
  • Optical fiber sensor-based natural gas pipeline leakage monitoring method and system and installation method for system

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Embodiment Construction

[0084] The present invention will be further described in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention should not be limited thereby.

[0085] Embodiment. The composition of this example is as figure 1 As shown, a fiber optic sensor is installed on the pipeline body every 1.5km, and a total of 10 sensors are installed. The first 5 sensors and the last 5 sensors form a sensor group respectively, and all fiber optic sensor groups share one fiber in the transmission cable with the The light source connection of the system is used as a launch fiber, and each fiber sensor group uses one fiber in the transmission cable to connect to the system photodetector as a return fiber; the output terminal of the photodetector includes the functions of leakage signal identification and event location The signal acquisition and processing module, the output of the signal acquisition and processing module is connected to the micro...

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Abstract

The invention discloses an optical fiber sensor-based natural gas pipeline leakage monitoring method, an optical fiber sensor-based natural gas pipeline leakage monitoring system and a system construction method. Optical fibers in a communication optical cable which is laid in the same channel of an oil and gas pipeline respectively serve as a transmitting optical fiber and a returning optical fiber; pipeline leakage optical fiber sensors are connected in parallel between transceiving transmitting optical fibers to form an optical path by an optical multiplexing technology; the pipeline leakage optical fiber sensors are uniformly arranged along the pipeline; laser light emitted from a light source is subjected to beam splitting through a transmission optical path and is transmitted to the sensors arranged on the wall of the pipeline; after the sensors pick up leakage vibration signals and noises propagated along the pipeline, the leakage vibration signals and the noises are returned to a photoelectric detector part of the system through the transmission optical path; the acquired vibration wave signals are analyzed and processed; and the position of a vibration wave source is determined by combining the propagation speed of the vibration wave on a pipeline body according to the time delay of the vibration waves propagated to the adjacent optical fiber sensors. By the method and the system, the flexibility is high; and the positioning accuracy is high.

Description

technical field [0001] The invention relates to a natural gas pipeline leakage monitoring system based on optical fiber sensing and an installation method of the system. It involves the measurement of mechanical vibration, the measurement of impact and the technical field of piping system. Background technique [0002] At present, the total length of pipelines built in the world has reached 2.5 million kilometers, which has surpassed the total mileage of railways and has become the main mode of energy transportation in the world. Oil transportation in developed countries and oil-producing regions in the Middle East has all realized pipelines. my country's pipelines have also developed rapidly in recent years, with a total length of more than 70,000 kilometers. A large energy pipeline network has initially formed across the east, west, north and south, covering the whole country, and connecting overseas. Pipeline transportation has become the deployment of strategic energy su...

Claims

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Application Information

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IPC IPC(8): F17D5/02
Inventor 张金权王小军焦书浩王飞程云涛马艳昉高杰谢文婧于立成于震红
Owner BC P INC CHINA NAT PETROLEUM CORP
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