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Finite element simulation method of top-tensioned riser hydraulic tensioner

A technology of hydraulic tensioner and simulation method, applied in the direction of constraint-based CAD, geometric CAD, design optimization/simulation, etc., can solve the deviation of top-tensioned riser, ignore the rigid body motion of floating platform, and do not consider tensioner gas Columns and standpipes, etc., to achieve reasonable and accurate results

Active Publication Date: 2020-02-28
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Compared with the tensioner in actual working conditions, the above three simulation methods have the following defects: 1) It does not consider that the air column of the tensioner and the standpipe are not vertical, but there is a certain angle; 2) It does not consider the tension The device contains four gas columns instead of one
Therefore, the existing processing methods cannot truly reflect the tension-stroke relationship characteristics of the tensioner, and the mechanical model of the top-tensioned riser established based on this does not match the reality, which will eventually lead to a discrepancy between the calculated response of the top-tensioned riser and the actual response. large deviation
[0008] Secondly, regarding the treatment of the relationship between the floating platform, the tensioner and the riser, the current processing method often applies the motion of the floating platform directly to the top of the riser or the spring, which ignores the Rigid body motion of the platform

Method used

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  • Finite element simulation method of top-tensioned riser hydraulic tensioner
  • Finite element simulation method of top-tensioned riser hydraulic tensioner
  • Finite element simulation method of top-tensioned riser hydraulic tensioner

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Embodiment 1

[0049] Such as Figure 1-3 As shown, the finite element simulation method of the hydraulic tensioner of the top-tensioned riser 1 in a preferred embodiment of the present invention includes the following steps.

[0050] Step S1, determining the structural properties, geometric properties, material properties of the top tension riser 1 and the distribution of the underwater part and the above water part of the riser.

[0051] Step S2, calculating the dry weight W of the above-water portion of the top-tensioned riser 1 d and the wet weight of the underwater part W w .

[0052] Step S3, determining the tension factor f of the tensioner.

[0053] Step S4, calculate the vertical component T of the nominal tension of the tensioner up =W d +f·W w .

[0054]Step S5, determining the initial angle θ between the air column 3 of the tensioner and the riser.

[0055] Step S6. Calculate the nominal tension in the 3 directions of each air column of the tensioner

[0056] Step S7, ...

Embodiment 2

[0073] The finite element simulation method of the hydraulic tensioner of the top-tensioned riser 1 of this embodiment further improves the technical solution of the first embodiment, which includes all the contents of the first embodiment.

[0074] The finite element simulation method of the top-tensioned riser 1 hydraulic tensioner of the present embodiment, such as Figure 1-3 shown, including the following steps.

[0075] Step S1, determining the structural properties, geometric properties, material properties of the top tension riser 1 and the distribution of the underwater part and the above water part of the riser. Among them, the structural attributes include the number of outer casing and inner tubing, and further, the geometric attributes include inner and outer diameters and wall thickness. , the material properties include material specification and material density.

[0076] Step S2, calculating the dry weight W of the above-water portion of the top-tensioned ri...

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Abstract

The invention discloses a finite element simulation method for a hydraulic tensioner of a top tensioned riser. The method comprises the steps of processing a floating platform into a rigid body, namely, establishing a rigid body connection between the gravity center of the platform and a platform deck (namely, the top of the tensioner), and applying a motion of the platform to the gravity center position of the platform during finite element analysis subsequently, so that the motion of the platform can be correctly transmitted to the top of the riser in combination with the gravity center of the platform, the platform deck (connected with the top end of the tensioner) and a tension ring (located at the top of the riser). According to the method, a tension-stroke relationship characteristic of the tensioner can be reasonably simulated and a relationship among the floating platform, the tensioner and the riser can be correctly handled; and in addition, the tension and motion at the top of a top tensioned riser model better conform to reality, so that the finite element analysis of the top tensioned riser is more reasonable and accurate.

Description

technical field [0001] The invention relates to the technical field of top-tensioned riser analysis in ocean engineering equipment, in particular to a finite element simulation method for a top-tensioned riser hydraulic tensioner. Background technique [0002] The tensioner system is the key equipment in the field of marine engineering, and the top-tensioned riser is connected to the floating platform through the tensioner system. The function of the tensioner is to adjust the huge force of the floating platform on the riser, which directly affects the overall response of the riser and protects the riser structure. The tensioner can ensure that the riser avoids buckling under pressure when the platform moves downward, and acts as a buffer when the platform moves upward. During the finite element analysis of the top-tensioned riser, the tensioner system needs to be simulated, both to reasonably simulate the tension-stroke relationship characteristics of the tensioner, and to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17G06F30/23G06F111/04
CPCG06F30/17G06F30/23G06F2111/04
Inventor 罗东红刘义勇王一江高静坤刘浩杨壮春李小龙郝晓楠
Owner CHINA NAT OFFSHORE OIL CORP