Distributed optical fiber sensor based tracking and positioning method of detector in oil conveying pipe

Abstract

The invention discloses a distributed optical fiber sensor based tracking and positioning method of a detector in an oil conveying pipe and relates to the tracking and positioning field of detectors in oil conveying pipes. The distributed optical fiber sensor based tracking and positioning method comprises serving distributed optical fibers which are laid in an optical cable near the oil conveying pipe as a sensor and picking up vibration signals produced in the movement process of the detector arranged in the oil conveying pipe and implementing the tracking and positioning on the detector arranged in the pipe through a terminal computer according to the vibration signals. According to the distributed optical fiber sensor based tracking and positioning method of the detector in the oil conveying pipe, the method is simple, the optical fibers which are arranged in the optical cable on a pipeline on which the optical cable is laid, and devices such as a ground marker and a GPS (Global Positioning System) module do not need to be placed along the pipeline for the auxiliary tracking and positioning and a system is stable, the devices such as the computer and a laser light source required by the system are placed in a terminal station, and the long-term stable work of the devices are facilitated in compassion with devices in the environments such as an acoustic transmitting method, a magnetic signal transmitting method, a radioactive source transmitting method and an electromagnetic pulse transmitting method.

Description

technical field [0001] The invention relates to the field of tracking and positioning of detectors in oil pipelines, in particular to a method for tracking and locating detectors in oil pipelines based on distributed optical fiber sensors. Background technique [0002] Since the 1970s, my country has built large-scale oil and gas pipelines. Up to now, a systematic oil and gas pipeline network has been gradually built. However, due to natural corrosion, manufacturing defects and man-made damage, pipeline accidents occur frequently, resulting in serious consequences such as loss of national property and living environment pollution. All parties pay more and more attention to pipeline leakage detection. Pipeline leak detection includes various detection methods such as external detection and internal detection. Among them, the internal detection method has the advantages of high precision, accurate location of leak points, and ability to detect small leaks, and has been increas...

AI Technical Summary

Problems solved by technology

The main disadvantages of the electromagnetic pulse emission method are: the electromagnetic signal emitting device continuously emits electromagnetic signals, which consumes a lot of power and has high requirements for the power system; Interference and misjudgment are serious; multiple sets of ground markers need to be placed along the pipeline to assist in tracking and positioning

The main disadvantages of the acoustic method are: when the direction or specific location of the pipeline is not known, ground receiving devices cannot be installed; a large number of ground receiving devices are needed to assist tracking, and tracking is intermittent and fixed-point; it is greatly affected by the external environment

The main disadvantage of the radioactive source method is that it can only be applied to pipelines with shallow buried depths and thin walls.

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