Buried oil pipeline external-corrosion real-time monitoring device based on optical fiber sensor

Abstract

The invention relates to a buried oil pipeline external-corrosion real-time monitoring device based on an optical fiber sensor, belonging to the technical field of sensing detection. The buried oil pipeline external-corrosion real-time monitoring device based on the optical fiber sensor is characterized by comprising a microprocessor, a spectrum demodulator and a blazed fiber brag grating sensor;the microprocessor is connected with the spectrum demodulator which is connected with the blazed fiber brag grating sensor; the blazed fiber brag grating sensor consists of a blazed fiber brag grating, a needle-like housing and a protective sleeve; and the blazed fiber brag grating is assembled in the needle-like housing, an optical fiber of the spectrum demodulator is connected into the needle-like housing, and the end part of the needle-like housing is provided with the protective sleeve. The invention has the advantages of simple structure, compact design, convenience of operation, low manufacture cost, stable performance, interference resistance, corrosion resistance, high measurement accuracy, real-time detection, high cost performance and the like, and is suitable for working in a severe environment.

Description

technical field [0001] The invention belongs to the technical field of sensing and detection, in particular to a real-time monitoring device for external corrosion of buried oil and gas pipelines based on optical fiber sensing. Background technique [0002] At present, oil and gas pipelines are important equipment for oil and gas production facilities. The external corrosion of pipelines is usually caused by water, air, and bacteria, and the damage of the external anti-corrosion layer is an important reason for pipeline corrosion. the [0003] Sacrificial anode protection is usually used in the daily maintenance of traditional buried pipelines. The detection methods are mostly based on the NACE ECDA (External Corrosion Direct Assessment) method, and multiple detection methods such as PCM, DCVG / ACVG, and CIPS are often used in the detection of external anti-corrosion layers. In practical applications, due to the complex environmental factors of field pipelines, various condi...

AI Technical Summary

Problems solved by technology

In practical applications, due to the complex environmental factors of field pipelines, various conditions such as terrain, surface structures, and crops along the line restrict the adoption of the above-mentioned technical means, so there is always a certain blind spot, which increases the risk of pipeline failure; Rely on the current signal to indirectly judge the condition of the outer anti-corrosion layer, and then indirectly judge the condition of the pipeline. However, considering that the signal is more affected by complex environmental factors, there are many errors in the excavation verification work. Although it is within the scope of technical permission, it has caused maintenance. Waste of cost and delay in finding problem spots

In summary, since the traditional technology cannot meet the actual needs in terms of time, position judgment, trend prediction and other aspects, the invention of a new real-time online monitoring technology that can judge the corrosion status outside the pipeline is particularly necessary

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