A Multi-Purpose Finite Element Model for Flexible Risers Studies

Caleyron, Fabien; Guiton, Martin; Leroy, Jean-Marc; Perdrizet, Timothée; Charliac, David; Estrier, Pascal; Paumier, Laurent

doi:10.1115/omae2014-23250

Cited by 6 publications

(5 citation statements)

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“…By assuming that both the shell and the carcass have the same stiffness (membrane, bending and torsion), they determined the equivalent properties of that orthotropic shell. This method is often used to study the responses of carcass layer subjected to axial loads [37][38][39] or crush [3,[40][41][42] due to the orthotropic mechanical properties of the equivalent shell. Since the carcass layer, however, withstands radial loads, mostly, the treatment of helical carcass wire as a homogeneous ring by discarding its lay angle in collapse studies is more ac- .…”

Section: Methodsmentioning

confidence: 99%

A review on predicting critical collapse pressure of flexible risers for ultra-deep oil and gas production

Jiang

Hopman

2018

Applied Ocean Research

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Flexible riser is a key enabler for the oil and gas production in ultra-deep water which transports production fluids between floating production systems and subsea wells. As oil and production heads to water depths in excess of 3000 m, high hydrostatic pressure has been one primary challenge facing the riser operators. Excessive hydrostatic pressure may cause collapse failure of flexible risers and thus predicting the critical collapse pressure is of significant importance to their anti-collapse design. Collapse is a complex phenomenon related to the material properties, the geometry of the pipe and its overall surface topography. Those factors make the prediction of critical pressure of flexible risers challenging. Related prediction approaches of collapse pressure of flexible risers have been developed for decades, yet a comprehensive review of their predictive capabilities, efficiency and drawbacks is lacking. This paper reviews the recent advances on collapse studies of flexible risers and highlights the gaps in existing prediction methods, aiming to facilitate the current anti-collapse design of flexible risers and provide a baseline for their future utilization in deeper water expansion.

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Section: Methodsmentioning

confidence: 99%

A review on predicting critical collapse pressure of flexible risers for ultra-deep oil and gas production

Jiang

Hopman

2018

Applied Ocean Research

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“…Numerical methods facilitated some simplifications of unbonded flexible risers, generally by simplifying the internal structure (carcass layer, pressure armor layer, internal sheath layer, etc.) into a rigid core layer [ 143 , 144 , 145 ], and the radial and lateral failure characteristics were investigated, taking into account the effects of material nonlinearity and other factors.…”

Section: Development Of Cross-sectional Properties Of An Unbonded Fle...mentioning

confidence: 99%

Review of the Development of an Unbonded Flexible Riser: New Material, Types of Layers, and Cross-Sectional Mechanical Properties

Liu,

Qu,

Chen

et al. 2024

Materials

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Unbonded flexible risers consist of several helical and cylindrical layers, which can undergo large bending deformation and can be installed in different configurations to adapt to harsh marine environments; thus, they can be applied to transport oil and gas resources from ultra-deep waters (UDW). Due to their special geometric characteristics, they can ensure sufficient axial tensile stiffness while having small bending stiffness, which can undergo large deflection bending deformation. In recent years, the development of unbonded flexible risers has been moving in an intelligent, integrated direction. This paper presents a review of unbonded flexible risers. Firstly, the form and properties of each interlayer of an unbonded flexible riser are introduced, as well as the corresponding performance and configuration characteristics. In recent years, the development of unbonded flexible risers has been evolving, and the development of machine learning on unbonded flexible risers is discussed. Finally, with emphasis on exploring the design characteristics and working principles, three new types of unbonded flexible risers, an integrated production bundle, an unbonded flexible riser with an anti-H2S layer, and an unbonded flexible riser with a composite armor layer, are presented. The research results show that: (1) the analytical methods of cross-sectional properties of unbonded flexible risers are solved based on ideal assumptions, and the computational accuracy needs to be improved. (2) Numerical methods have evolved from equivalent simplified models to models that account for detailed geometric properties. (3) Compared with ordinary steel risers, the unbonded flexible riser is more suitable for deep-sea resource development, and the structure of each layer can be designed according to the requirements of the actual environment.

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“…This was addressed by using a surface-based penalty method. According to the work of Gay Neto and Martins (2014) and Caleyron et al (2014), a Coulomb friction coefficient of 0.15 was adopted for the tangent sliding between layers while a penalty stiffness factor of 0.1 was used in normal contact. By using the sweep meshing technique, Model-A was meshed as Figure 7.…”

Section: Model Descriptionmentioning

confidence: 99%

Curvature effect on wet collapse behaviours of flexible risers subjected to hydro-static pressure

Jiang

Hopman

2020

Ships and Offshore Structures

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A Multi-Purpose Finite Element Model for Flexible Risers Studies

Cited by 6 publications

References 0 publications

A review on predicting critical collapse pressure of flexible risers for ultra-deep oil and gas production

A review on predicting critical collapse pressure of flexible risers for ultra-deep oil and gas production

Review of the Development of an Unbonded Flexible Riser: New Material, Types of Layers, and Cross-Sectional Mechanical Properties

Curvature effect on wet collapse behaviours of flexible risers subjected to hydro-static pressure

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