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Grounding vibration experimental method and system of steel catenary riser

A steel catenary and experimental system technology, applied in vibration testing, measuring devices, testing of machine/structural components, etc., can solve problems such as high cost, long cycle, and geographical constraints, and achieve easy adjustment and simple overall structure. Effect

Inactive Publication Date: 2011-08-03
CHINA NAT OFFSHORE OIL CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this experiment has the obvious disadvantages of excessive cost, long period, and limited by geographical conditions. At the same time, it is unable to investigate the damping effect of the ocean current near the seabed and the influence of different properties of the seabed foundation soil.

Method used

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  • Grounding vibration experimental method and system of steel catenary riser
  • Grounding vibration experimental method and system of steel catenary riser
  • Grounding vibration experimental method and system of steel catenary riser

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Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] The implementation method of the present invention can be summarized as the following contents:

[0017] 1) Set up a water tank, and lay clay at the bottom of the water tank with physical properties and mechanical properties close to that of the prototype seabed sea soil. A water outlet is set on the tank, and the ocean current in the bottoming area of ​​the standpipe is simulated by circulating the outlet water back;

[0018] 2) By using the truncation simulation method, a model of the bottoming section of the riser is set in a limited tank, and a vertical load and a horizontal lateral load are applied to one end of the model of the bottoming section of the riser to simulate the vertical movement of the steel catenary caused by the movement of the floating body. Pipe bottoming vibration, and seabed grooves formed by pipe-soil interaction;

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Abstract

The invention relates to grounding vibration experimental method and system of a steel catenary riser. The grounding vibration experimental method of the steel catenary riser comprises the following steps of, firstly, arranging a flume, paving clay which has close physical property and mechanical property with prototype seabed soil at the bottom of the flume, arranging a wave absorbing region at the end of the flume, arranging a water outlet on the flume above the wave absorbing region, and simulating an ocean current in a riser grounding region in a mode of circulating refluxing of effluent, wherein the water level in the flume is higher than the upper surface of the clay; secondly, with the application of a method of truncation simulation, arranging a riser grounding segment model in the limited flume, applying the vertical load and the horizontal lateral load at one end of the riser grounding segment model, and simulating grounding vibration of the steel catenary riser caused by motion of a floating body and a seabed groove formed with pipe-soil interaction; and thirdly, through an acceleration sensor and a strain gauge which are arranged on the riser grounding segment model at intervals, collecting a response signal of grounding vibration of the model, thereby influences on grounding vibration of the steel catenary riser of the seabed surface soil body property and different flow rate damping conditions are acquired.

Description

technical field [0001] The invention relates to a vibration experiment method and system, in particular to a method and system for a steel catenary riser bottoming vibration experiment. Background technique [0002] Steel catenary risers are the most commonly used connecting pipes between subsea production systems and floating platforms. Affected by the heave movement of the floating platform, the bottom section of the steel catenary riser is always in a dynamic contact state with the seabed, which can easily cause fatigue damage. Safety brings difficulties and hidden dangers. The relationship between the pipe-soil interaction between the bottom section of the steel catenary riser and the seabed is complex, and corresponding experiments have become a necessary means for research in this field. [0003] It is very difficult to conduct a full-scale steel catenary riser grounding experiment. Some studies have realized a full-scale catenary riser grounding experiment using the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02
Inventor 曹静赵天奉张恩勇段梦兰沙勇胡知辉陈严飞
Owner CHINA NAT OFFSHORE OIL CORP
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