Method for testing influences of internal flow to dynamic property of marine risers

Abstract

The invention belongs to the technical field of pavement of marine riser facilities, and particularly relates to a test method and a device. By the aid of the test method and the device, internal flow and top tension can be effectively applied during analog study of a marine riser vortex induced vibration law, and influences of the internal flow to the dynamic property of marine risers are tested. When in marine riser vortex induced vibration test study by the aid of the test device applying the internal flow and the top tension and the test method realized by the device, the top tension with the known intensity is continuously applied, and the intensity of the internal flow and the intensity of external flow are respectively changed, so that the influences of the internal flow to the dynamic property of the marine risers are determined by a strain gauge and a fiber bragg grating testing method. During the analog study of the marine riser vortex induced vibration law, the influences of the internal flow to the dynamic property of the marine risers can be tested, so that accuracy of a marine riser vortex induced vibration model test is improved, and an accurate test conclusion can be obtained.

Description

technical field [0001] The invention belongs to the technical field of laying of marine riser facilities, in particular to a device that can effectively apply internal flow and top tension when simulating and studying the law of vortex-induced vibration of marine risers, and test the influence of internal flow on the dynamic characteristics of marine risers test methods and devices. Background technique [0002] The marine riser is the main connection between the offshore platform and the subsea wellhead. As a communication channel between the sea surface and the seabed, it can be used for fixed platforms, floating platforms and drilling ships. The slenderness ratio of marine risers is very large, and under the action of marine environmental loads, such as wind, waves, and currents, vortex-induced vibration may occur, thereby accelerating its fatigue failure. Most of the marine risers are used to transport flammable and explosive materials such as oil and natural gas. Once...

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Problems solved by technology

[0004] However, in the current domestic ocean riser model tests, it is still not possible to simulate the actual engineering well, so that the conclusions drawn are not universal

The main problems are: some tests choose one or two of the factors for preliminary research on the law of vortex induced vibration, but fail to take the three factors into consideration, resulting in one-sided conclusions; although the top tension can be applied during the test, However, the magnitude of the top tension changes with time, and its value cannot be accurately measured; the riser joints are not strictly consolidated or hinged, and most of them are in a semi-articulated state

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