Steel catenary riser grounding fatigue uncertainty analysis method

A steel catenary, uncertainty technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as the difficulty of simulating the real state of steel catenary risers, and achieve the effect of avoiding major mistakes

Inactive Publication Date: 2018-11-13
TIANJIN UNIV
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Problems solved by technology

[0006] 2) There are nonlinear reaction force and suction in the seabed soil, and it involves large deformation problems at the same time, so it is very difficult to simulate the real state of the steel catenary riser

Method used

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  • Steel catenary riser grounding fatigue uncertainty analysis method
  • Steel catenary riser grounding fatigue uncertainty analysis method
  • Steel catenary riser grounding fatigue uncertainty analysis method

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specific Embodiment

[0036] Establish the coupling model of riser and FPSO under specific wave spectrum and typical soil parameters, and obtain statistically the probability density function and cumulative probability function of the touchdown point position distribution under short-term sea conditions, and obtain the 90% confidence interval of the touchdown point position; establish a nonlinear Soil models such as figure 2Shown; form a steel catenary riser system. According to the above two models, the static force analysis of the pipe-soil action at the contact point of the riser is carried out, and the embedded soil depth time history curve, the soil force time history curve, and the displacement-force curve including different motion cycle times are given. According to the above two models, the overall hydrodynamic analysis of the riser is carried out, and the characteristic load time history curve and the stress distribution at the contact point are obtained. Combining the results of the st...

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Abstract

The invention discloses a steel catenary riser grounding fatigue uncertainty analysis method. The method comprises the following steps: constructing the steel catenary riser system to perform riser fatigue analysis; performing sensitive analysis on the riser grounding point fatigue damage by importing the Morris method; and performing simulation study on the grounding point fatigue life uncertainty by adopting a Monte Carlo method. The steel catenary riser grounding point fatigue analysis precision is improved, and the analysis design of the steel catenary riser is more suitable for the engineering actual condition.

Description

technical field [0001] The invention belongs to the deep-sea riser research technology, and more specifically relates to a method for analyzing the ground contact fatigue uncertainty of a steel catenary riser. Background technique [0002] The riser is used to connect the floating body on the sea surface with the wellhead on the seabed and transport oil and gas resources. It is the key equipment for deep sea oil and gas development and has an irreplaceable role. As the water depth increases, the cost and difficulty of riser system construction and installation rapidly increase, and a reasonable deep-sea riser solution has become an important issue in the field of deep-sea oil and gas development. [0003] As a new type of riser, steel catenary riser (SCR) has unique advantages in cost, working water depth and compliance, and has been widely used; on the other hand, the nonlinear dynamic characteristics of steel catenary riser are obvious , its design, construction, installa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2113/14G06F2119/04
Inventor 李英吴潘丁鹏龙
Owner TIANJIN UNIV
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