Non-invasive distributed optical fiber pipeline monitoring system and method based on sound wave detection

Abstract

The invention discloses a non-invasive distributed optical fiber pipeline monitoring system and method based on sound wave detection. The system comprises a light source generation module, a distributed sensing optical fiber, a data acquisition module and a data processing module which are connected in sequence, wherein the distributed sensing optical fiber is arranged on the outer wall of a pipeline to be measured and is distributed in the axial direction of the pipeline. The method comprises the steps of collecting a sound wave time domain signal, obtained through interaction of fluid and the pipe wall, of the distributed sensing optical fiber, and obtaining a first frequency band and a second frequency band of a frequency domain signal and a first peak frequency and a second peak frequency as well as a first power spectrum intensity and a second power spectrum intensity corresponding to the first frequency band and the second frequency band of the frequency domain signal respectively by utilizing the Fourier transform after the differential processing. According to the above information, flow velocity measurement, leakage monitoring, leakage point two-dimensional positioning, pipeline blockage situation judgment and real-time measurement of the sand content concentration are realized, secondary construction of the pipeline is avoided, and great application potential is achieved in scenes such as petroleum exploratory well pipelines and underground drainage pipelines.

Description

technical field [0001] The invention belongs to the technical field of pipeline monitoring, and more specifically relates to a non-invasive distributed optical fiber pipeline monitoring system and method based on acoustic wave detection. Background technique [0002] Since the reform and opening up, the national economy has developed rapidly, and our country's demand for energy has also increased rapidly. Energy issues are related to national life and the country's comprehensive competitiveness. They are the foundation of national development and are also a key development and concern issue in our country. Among the many types of energy, oil and gas resources such as natural gas play a particularly important role, and the safety of its storage and transportation is gradually receiving attention. The long-distance pipeline transportation method covers a wide range, and the pipeline can span multiple regions. And forming a complex oil and gas pipeline transportation network h...

AI Technical Summary

Problems solved by technology

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a non-invasive distributed optical fiber pipeline monitoring system and method based on acoustic wave detection, aiming to solve the problem of single function and poor applicability of the current pipeline monitoring system

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