Method for testing vortex-induced vibration of suspended flexible standpipe based on open channel experiment water tank

Abstract

The invention relates to a method for testing the vortex-induced vibration of a suspended flexible standpipe based on an open channel experiment water tank. The method employs the open channel experiment water tank and comprises the following steps of: (1) placing an experiment standpipe; (2) constructing a water flow environment of the open channel experiment water tank; (3) placing a testing instrument; (4) testing the velocity profile of a shear flow; and (5) testing the vibration response of the flexible standpipe. The water tank bottom slope, the water flow, the water depth, the velocity profile of the shear flow, the flexible standpipe material and size can be adjusted according to an experiment requirement. The method captures the vibration displacement of a mark point on the flexible standpipe by using two high-speed video cameras so as to achieve non-intervention interference-free flexible standpipe vibration testing under a shear flow velocity profile condition.

Description

technical field [0001] The invention belongs to the technical field of experimental testing of vortex-induced vibration of marine risers, and in particular relates to a test method for vortex-induced vibration of suspended flexible risers based on an open channel experimental water tank. Background technique [0002] In 2014, my country's dependence on foreign oil has reached 59.5%. Such a large energy gap will inevitably have an important impact on my country's economic development and national security. In order to ensure the normal operation of my country's industrial and agricultural production and safeguard our country's national defense security, it is necessary to intensify the development of oil and gas resources. Due to the rapid depletion of onshore oil and gas resources, in order to improve recovery and increase oil and gas production, onshore oilfield companies are forced to exploit low-permeability and ultra-low-permeability oilfields, marginal oilfields, coalbe...

AI Technical Summary

Problems solved by technology

Existing vortex-induced vibration experiments on marine risers are mainly carried out in circulating water tanks and simulated pools, using strain gauges, acceleration sensors, displacement sensors, etc. to test the vibration response of the riser, but these test instruments must be installed on the surface of the riser Change the flow field around the standpipe, thereby changing the vibration response of the standpipe, resulting in a certain deviation in the data collected by the vibration test

Some test instruments need to be wired and powered on, so that the riser model involves multiple cables, which not only affects the normal vibration response of the riser, but also has hidden dangers of electric leakage

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