An interferometric distributed optical fiber leakage monitoring device for tensioned risers on the top of the ocean

Abstract

The invention discloses a marine top tension riser leakage monitoring device with interference type distributed optical fibers. The marine top tension riser leakage monitoring device comprises a first light path system, a second light path system, a signal processing system and a distributed optical fiber sensing system. A first sensing optical fiber, a first Faraday rotation mirror, a second sensing optical fiber and a second Faraday rotation mirror of the distributed optical fiber sensing system are connected with the first light path system to form three interferometers; a third sensing optical fiber, a third Faraday rotation mirror, a fourth sensing optical fiber and a fourth Faraday rotation mirror of the distributed optical fiber sensing system are connected with the second light path system to form three interferometers. The first light path system and the second light path system transmit light signals to the distributed optical fiber sensing system in the opposite directions respectively. The signal processing system is used for processing output interference light signals so as to locate pipeline leakage positions. The device can be used for detecting marine riser leakage conditions and can also be used for monitoring events which may cause pipeline leakage along a pipeline, the device can give out early alarming in time and accurately locate the pipeline leakage positions, and operation is reliable.

Description

technical field [0001] The invention relates to an ocean riser structure health monitoring device, in particular to an interference type distributed optical fiber ocean top tension riser leakage monitoring device. Background technique [0002] As the main connecting device between the offshore platform and the subsea wellhead, the offshore platform riser is one of the weak and vulnerable components in the offshore structural system. Its lower end generally touches the seabed directly, and its upper end is connected to the oil and gas facilities of the offshore platform or drilling ship. Top tensioning riser refers to applying initial tension on the top of the riser so that it is in a tensioned state along the height of the arrangement, and it is widely used in various types of platforms. In the actual working sea conditions, the interior of the marine riser generally has high-pressure oil or gas passing through it, and the outside is subjected to complex environments such as...

AI Technical Summary

Problems solved by technology

In the actual working sea conditions, the interior of the marine riser generally has high-pressure oil or gas passing through it, and the outside is subjected to complex environments such as ocean currents, waves, marine life impacts, and floating bodies on the top. Changes, local scouring of pipelines, resulting in pipeline leakage or breakage, oil and gas leakage, serious environmental pollution, and endangering the safety of other facilities, etc.

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