A test method for vortex-induced vibration of suspended flexible riser based on open channel experimental tank

Abstract

The invention relates to a method for testing vortex-induced vibration of a suspended flexible standpipe based on an open channel experimental water tank. The open channel experimental water tank is used, comprising the following steps: (1) arranging the experimental standpipe; (2) constructing the water flow environment of the open channel experimental water tank; (3) ) arranging test instruments; (4) testing the velocity profile of the shear flow; (5) testing the vibration response of the flexible riser. The tank bottom slope, water flow rate, water depth, shear flow velocity profile, flexible standpipe material and size can be adjusted according to experimental needs. The invention realizes the non-intervention and non-interference vibration test of the flexible riser under the condition of the shear flow velocity profile by capturing the vibration displacement of the marked point on the flexible standpipe by two high-speed cameras.

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

Images