Phi-OTDR based external damage vibration monitoring identification method of oil gas pipeline

A-OTDR, vibration monitoring technology, applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problem of long-distance distributed coverage, etc., and achieve the effect of long-distance vibration external breaking online monitoring

Active Publication Date: 2019-02-22
WUHAN WUTOS
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Problems solved by technology

At present, the monitoring of oil and gas pipelines is mainly realized by adding point sensors along the pipeline and using video surveil

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  • Phi-OTDR based external damage vibration monitoring identification method of oil gas pipeline
  • Phi-OTDR based external damage vibration monitoring identification method of oil gas pipeline
  • Phi-OTDR based external damage vibration monitoring identification method of oil gas pipeline

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[0047] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0048] see Figure 1 to Figure 2 As shown, the present invention is based on the φ-OTDR oil and gas pipeline breach and intrusion monitoring and identification method, including the following steps:

[0049]Step 1, using a phase-sensitive optical time domain reflectometer (φ-OTDR) to monitor and obtain optical fiber vibration signals caused by disturbances along the oil and gas pipeline;

[0050] Step 2, wavelet filtering is performed on the obtained vibration signal, and the DC component and low frequency component of the signal are filtered out;

[0051] Step 3, performing time-frequency transf...

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Abstract

The invention discloses a phi-OTDR based external damage vibration monitoring identification method of an oil gas pipeline. The method comprises the following steps that a phase-sensitive photosensitive time-domain reflectometer monitors and obtains a fiber vibration signal caused by disturbance along the oil gas pipeline; wavelet filtering is carried out on the obtained vibration signal, and DC and low-frequency components are filtered from the signal; the filtered vibration signal is converted into the time domain and frequency domain by short time Fourier transformation, and a time-frequency atlas of the vibration signal is obtained; according to time-frequency information features of mechanical work, mechanical digging impact and manual digging behaviors, characteristic information ofthe corresponding behaviors is extracted from the time-frequency atlas; and the mode of a behavior occurring in the surrounding of the monitored pipeline is determined and identified according to theextracted characteristic information, and alarm information is output. External damage behaviors including mechanical work, mechanical digging impact and manual digging behaviors in the surrounding ofthe monitored pipeline can be identified effectively, and real-time long-distance online monitoring is realized for vibration external damage of the oil gas pipeline.

Description

technical field [0001] The invention relates to the field of oil and gas transportation pipeline operation and maintenance, in particular to a φ-OTDR-based vibration monitoring and identification method for oil and gas pipeline breakage. Background technique [0002] Oil and gas pipelines cover a wide range, and most of them are in unsupervised areas in the wild. Incidents such as perforating oil and destroying the normal operation of pipelines often occur. Therefore, real-time monitoring and early warning of oil and gas pipelines has important safety and production , Economic significance. At present, the monitoring of oil and gas pipelines is mainly achieved by adding point sensors along the pipelines and using video surveillance for local areas. These methods can only monitor local oil and gas pipelines, and cannot achieve long-distance distributed coverage. Contents of the invention [0003] The purpose of the present invention is to provide a monitoring and identific...

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 刘洪凯彭特李俊闫奇众徐绍刚
Owner WUHAN WUTOS
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