Finite element and theoretical analyses of bisymmetric collapses in flexible risers for deepwaters developments

Cuamatzi-Meléndez, Rubén; Castillo-Hernández, O.; Vázquez-Hernández, A.O.; Vaz, Murilo Augusto

doi:10.1016/j.oceaneng.2017.05.032

Cited by 28 publications

(5 citation statements)

References 7 publications

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“…As the ring thickness is simply determined by the cross-sectional area in those methods, the actual material distribution in the carcass profile is neglected. Therefore, it makes the prediction for the critical pressure of flexible pipe less accurate [48].…”

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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“…Structured and sweep meshing techniques are used in each part of the model, and the mesh is refined around the contact area to improve the accuracy of the simulation. Because of the nonlinear contact characteristics of metallic and polymeric materials, the Mohr-Coulomb friction criterion is employed to describe the contact relationship (i.e., normal contact is "hard" and tangential contact incurs a penalty under a friction coefficient of 0.1) [37].…”

Section: Fe Modeling Proceduresmentioning

confidence: 99%

Sealing Performance Analysis of an End Fitting for Marine Unbonded Flexible Pipes Based on Hydraulic-Thermal Finite Element Modeling

Tang

Zhu

et al. 2019

Energies

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End fittings are essential components in marine flexible pipe systems, performing the two main functions of connecting and sealing. To investigate the sealing principle and the influence of the temperature on the sealing performance, a hydraulic-thermal finite element (FE) model for the end fitting sealing structure was developed. The sealing mechanism of the end fitting was revealed by simulating the sealing behavior under the pressure penetration criteria. To investigate the effect of temperature, the sealing behavior of the sealing ring under different temperature fields was analyzed and discussed. The results showed that the contact pressure of path 1 (i.e., metal-to-polymer seal) was 31.7 MPa, which was much lower than that of path 2 (metal-to-metal seal) at 195.6 MPa. It was indicated that the sealing capacities were different for the two leak paths, and that the sealing performance of the metal-to-polymer interface had more complicated characteristics. Results also showed that the finite element analysis can be used in conjunction with pressure penetration criteria to evaluate the sealing capacity. According to the model, when the fluid pressures are 20 and 30 MPa, no leakage occurs in the sealing structure, while the sealing structure fails at the fluid pressure of 40 MPa. In addition, it was shown that temperature plays a significant role in the thermal deformation of a sealing structure under a temperature field and that an appropriately high temperature can increase the sealing capacity.

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“…Although numerical analyses can be performed by modelling the flexible risers with all the metallic and polymeric layers, such analyses are computational intensive because of tremendous finite elements of the models. Moreover, the solutions may become unstable due to the stiffness matrix becoming singular [25]. Considering that, simplified flexible riser model has been adopted by researchers.…”

Section: Prediction Approaches Of Critical Pressurementioning

confidence: 99%

Prediction of the critical collapse pressure of ultra-deep water flexible risers-a: Literature review

Xiao¹,

Jiang²,

Hopman³

2018

FME Transaction

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Flexible riser is a device which transports production fluids between floating vessels and subsea wells. With fewer remaining easy-to-access oil fields nowadays, flexible risers are being required to be installed in a water depth of over 3000m. However, the hydrostatic pressure at such a water depth may cause the collapse of flexible risers, and therefore predicting the critical collapse pressure is of great importance to their design. Riser collapse is a complex phenomenon related to material properties, geometry of the pipe and its overall surface topography and, therefore, makes the prediction of critical pressure challenging. Collapse prediction approaches of flexible risers have been developed for decades, yet a comprehensive review on their predictive capabilities, efficiency and drawbacks is lacking. In this paper, the recent advances on collapse studies of flexible risers are reviewed, which summarizes the methods developed for critical pressure prediction and highlights the related gaps in current research. This review aims to facilitate the current anti-collapse design and be a baseline for future utilization of flexible risers in deeper water expansion.

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Finite element and theoretical analyses of bisymmetric collapses in flexible risers for deepwaters developments

Cited by 28 publications

References 7 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

Sealing Performance Analysis of an End Fitting for Marine Unbonded Flexible Pipes Based on Hydraulic-Thermal Finite Element Modeling

Prediction of the critical collapse pressure of ultra-deep water flexible risers-a: Literature review

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