Method for analyzing response of steel catenary riser to waves

A steel catenary and response analysis technology, applied in the testing of measuring devices, instruments, machinery/structural components, etc., can solve the problem of not considering the dynamic coupling between the floating platform and the steel catenary riser, not considering the seabed Soil suction restraint, insufficient precision of analysis results, etc.

Inactive Publication Date: 2010-05-26
OCEAN UNIV OF CHINA
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Problems solved by technology

The current analysis methods all use spring supports at the nodes (the lumped mass model can only act on the lumped mass) to simulate the continuous distribution of seabed soil constraint reaction force, therefore, it is a simplified analysis method, and its results are not accurate enough
[0016] It can be seen that the existing analysis methods for steel catenary risers do not consider the influence of the large deflection of the steel catenary riser on the stiffness of the riser, and do not consider the dynamic couplin

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  • Method for analyzing response of steel catenary riser to waves
  • Method for analyzing response of steel catenary riser to waves
  • Method for analyzing response of steel catenary riser to waves

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[0076] The present invention will be described in detail below in conjunction with the drawings.

[0077] The invention adopts the method of integral analysis of the floating platform and the steel catenary riser, adopts the large deflection curve beam model to simulate the steel catenary riser, adopts the rigid arm unit to simulate the floating platform, and adopts the elastic foundation beam model to simulate the seabed The restraint effect of soil, and the influence of seabed soil suction is considered.

[0078] 1. Curved beam model

[0079] The coordinate system of the curved beam model used in the present invention is such as figure 1 As shown, the motion equation of the steel catenary riser can be derived from this coordinate system: ρ r · · + ( Br ′ ′ ) ′ ′ - ( λr ) ′ - q = 0 - - - ( 1 )

[0080] Among them, ρ is the mass per unit length of the steel catenary riser, including the mass of fluid in the...

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Abstract

The invention belongs to a technique for researching a steel catenary riser of a deep-sea oil and gas platform and particularly relates to a method for analyzing the response of a steel catenary riser to waves. In the method, a model of an elastic ground beam is used to simulate a streamline section of the steel catenary riser and the simulative models of the overhung section and the streamline section of the steel catenary riser are combined with the equation of motion of a floating platform to built an integrated motion analysis model of the steel catenary riser and the floating platform, the equation of the integrated motion analysis model is solved to obtain the response of the steel catenary riser to waves, and at the same time, a model of the suction of sea bed soil is built according to the influence of the suction of the sea bed soil to the steel catenary riser and is used in the analysis of the response of the steel catenary riser to waves. The method can improve the accuracy of the calculation of the steel catenary riser and makes the analysis of the steel catenary riser closer to the actual situation of a project.

Description

technical field [0001] The invention belongs to the research technology of steel catenary risers of deep-sea oil and gas platforms, and in particular relates to a wave response analysis method of deep-sea steel catenary risers. Background technique [0002] The steel catenary riser is a new riser system for deep-sea oil and gas development. The first steel catenary riser was officially used in the development of deep-sea oil and gas resources in 1996. It is technically and economically superior to the traditional flexible riser and top tension The riser system has made great progress and has become the preferred riser system for the development of deep sea oil and gas resources. [0003] Compared with flexible risers, the cost of steel catenary risers is low; compared with top-tensioned risers, it does not require compensation for top tension and heave motion of floating bodies, and is considered to be an effective cost-reducing stand for deep-sea oil and gas resource develo...

Claims

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Application Information

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IPC IPC(8): G01M19/00G01M99/00
Inventor 黄维平白兴兰
Owner OCEAN UNIV OF CHINA
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