Calculation method for predicting length and position of sea ditch formed by interaction of flexible or steel catenary riser and seabed soil body

A calculation method, seabed soil technology, applied in the direction of calculation, computer-aided design, design optimization/simulation, etc., can solve the problem that the trench takes a long time, is not suitable for application, etc., achieves easy promotion, saves time, and improves accuracy. sexual effect

Active Publication Date: 2020-02-21
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] In engineering practice, when the overall finite element analysis of the catenary riser is carried out, the seabed in the contact area is usually flat seabed, and the influence of the trench on the fatigue life is ignored. This is mainly because in the finite element software It takes a long time to simulate a trench with a certain depth for a certain ocean current direction, which is obviously not suitable for engineering applications

Method used

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  • Calculation method for predicting length and position of sea ditch formed by interaction of flexible or steel catenary riser and seabed soil body
  • Calculation method for predicting length and position of sea ditch formed by interaction of flexible or steel catenary riser and seabed soil body
  • Calculation method for predicting length and position of sea ditch formed by interaction of flexible or steel catenary riser and seabed soil body

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Effect test

Embodiment 1

[0063] A calculation method for the length and position of the trench under a certain current direction. The relevant parameters of the trench such as figure 1 as shown,

[0064] Include the following steps:

[0065] 1) Establish a catenary riser model;

[0066] 2) Obtain the RTDP of the contact point position of the catenary riser when the seabed is flat;

[0067] 3) Set the current direction angle;

[0068] 4) Enter D 1 、D 2 value;

[0069] 5) Calculate D=1 / 3(D 1 +D 2 );

[0070] 6) Enter L 1 , L 2 value;

[0071] 7) Calculate L=1 / 3(L 1 +L 2 );

[0072] 8) Establish a trench model;

[0073] 9) Use the finite element software Orcaflex for static analysis;

[0074] 10) If it belongs to area A, judge whether L is more convergent than last time;

[0075] Among them, for the judgment result of whether L is more convergent than last time, if yes, then output L and D; if not, then judge L 2 =L, return to step 5);

[0076] 11) If it belongs to area B, then D 2 =...

Embodiment 2

[0081] A method for calculating the length and position of a trench under a certain current direction, comprising the following steps:

[0082] 1) Establish a catenary riser model; as follows image 3 As shown, the red cuboid at the top is the floating platform, the blue line represents the sea level, the green curve represents the catenary riser, the yellow line represents the seabed, and the white line represents the part where the seabed is in contact with the catenary riser.

[0083] 2) Obtain the RTDP of the touchdown point position of the catenary riser when the seabed is flat; after the catenary riser model is established in Orcaflex, perform static analysis. After the analysis, select the touchdown point (Touchdownnode) from the Results menu is an object, get its coordinate value, that is, get RTDP. as follows Figure 4 , the RTDP position is 446.0032m.

[0084] 3) Set the current direction angle;

[0085] 4) Enter D 1 、D 2 value;

[0086] 5) Calculate D=1 / 3(D ...

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Abstract

The invention relates to a calculation method for predicting the length and position of a sea ditch formed by interaction of a flexible or steel catenary riser and a seabed soil body. Before dynamic analysis is carried out, relevant parameters of the sea ditch are determined and added into finite element software, then overall dynamic analysis is carried out, a large amount of time can be saved, meanwhile, the influence of the sea ditch on the fatigue life of the catenary riser is fully considered, and the accuracy of evaluation of the fatigue life of the catenary riser is improved.

Description

technical field [0001] The invention belongs to the field of marine engineering riser design, in particular to a method for calculating the length and position of a trench formed by the interaction between a steel catenary riser and a seabed. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Submarine formations contain rich oil and natural gas resources. In recent years, major oil companies have focused on the development of oil resources in the deep sea. In recent years, flexible or steel catenary risers (flexible or steel catenary risers, hereinafter referred to as catenary risers) have been widely used in the field of deep-sea oil and gas transportation. The environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F113/14G06F119/04
Inventor 时晨庄肃然王森孙宝江娄敏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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