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Sensor suitable for long-distance submarine pipeline leakage monitoring and monitoring method thereof

A long-distance sensor technology, which is applied in the pipeline system, mechanical equipment, gas/liquid distribution and storage, etc., can solve the problems of being unsuitable for long-distance sea pipeline leakage monitoring, limiting detection sensitivity, and large sensor volume, etc. The effect of precise demodulation, fast and reliable binding, and high sensing sensitivity

Pending Publication Date: 2021-06-11
THE 23RD RES INST OF CHINA ELECTRONICS TECH GRP CORP
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Problems solved by technology

[0009] The above reasons make the existing distributed optical fiber temperature / vibration sensing technology not suitable for long-distance sea pipeline leakage monitoring
The quasi-distributed pipeline leakage monitoring system proposed by the above-mentioned patent CN102997063A is not suitable for embedding in the counterweight protection layer of the sea pipeline due to the relatively large sensor volume; There is a certain energy loss on the sensing fiber, which limits the further improvement of detection sensitivity

Method used

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  • Sensor suitable for long-distance submarine pipeline leakage monitoring and monitoring method thereof
  • Sensor suitable for long-distance submarine pipeline leakage monitoring and monitoring method thereof
  • Sensor suitable for long-distance submarine pipeline leakage monitoring and monitoring method thereof

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Embodiment

[0048] Since the leakage monitoring and verification of sea pipes at sea is a large project and takes a long time, we use tap water pipes to simulate and verify the leakage monitoring effect.

[0049] Such as Figure 7 As shown, a 10m-long tight-clad optical fiber with a cladding diameter of 80μm and a small-mode-field optical fiber with a cladding diameter of 80 μm is evenly wound on a 3-meter-long metal water pipe 71 with a diameter of Φ20mm to form a second vibration sensitive coil 72 . The periphery is wrapped and fixed with tape. One end of the tightly wrapped optical fiber is connected with a second Faraday reflector 73 . The second vibration sensitive coil 72 forms a pair of vibration sensing fiber optic interferometer together with the peripheral third fiber coupler 74 and the second Faraday reflector 73 through the fiber optic connector, wherein the fiber length of the reference arm is 40mm. The vibration sensing fiber optic interferometer is connected with a C-ban...

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Abstract

The invention relates to the technical field of submarine oil and gas pipeline leakage monitoring, and provides a sensor suitable for long-distance submarine pipeline leakage monitoring and a monitoring method thereof. Vibration sensing fibre optic interferometers are arranged on leakage monitoring points of a long-distance submarine pipeline, a dry end signal processing equipment inputs optical signals to the vibration sensing fibre optic interferometer of each monitoring point through a main optical cable; after the input optical signals pass through the vibration sensing fibre optic interferometer of each monitoring point, interference light is output and is output to the dry end signal processing equipment through the main optical cable; the dry end signal processing equipment demodulates the change of an optical phase in a vibration sensitive coil from the change of the light intensity of the interference light output by the vibration sensing fibre optic interferometer of each monitoring point, and obtains the magnitude of a vibration signal causing the change of the optical phase; and through signal analysis and processing, the vibration sensing fibre optic interferometers whose vibration signals exceed an early warning value are identified, and the positions of the leakage points are positioned.

Description

technical field [0001] The invention relates to the technical field of leakage monitoring of submarine oil and gas pipelines, in particular to a sensor suitable for monitoring leakage of long-distance submarine oil and gas pipelines and a monitoring method thereof. Background technique [0002] Submarine pipelines are the most economical and reasonable choice for offshore oil and natural gas transportation. As of the end of 2015, my country has built a total of 336 submarine pipelines, with a cumulative length of about 6307km, which are responsible for the transportation of important energy such as marine crude oil and natural gas. However, with the continuous construction of submarine pipelines and the continuous increase in service time, the potential risks of damage to submarine pipelines such as seawater corrosion and third-party damage are also accumulating, resulting in continuous occurrence of submarine oil and gas pipeline leakage accidents. According to statistics,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17D5/02F17D5/00
CPCF17D5/02F17D5/005
Inventor 高侃陈绪兴吴昺炎
Owner THE 23RD RES INST OF CHINA ELECTRONICS TECH GRP CORP
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