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

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,...

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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

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