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

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...

AI Technical Summary

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 surveillance for local areas. These methods can only monitor local oil and gas pipelines, and cannot achieve long-distance distributed coverage.

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