Marine riser emergency disconnection analysis using scalar elements for tensioner modelling

Pestana, Rafael Guimarães; Roveri, Francisco Edward; Franciss, Ricardo; Ellwanger, Gilberto Bruno

doi:10.1016/j.apor.2016.05.004

Cited by 48 publications

(3 citation statements)

References 1 publication

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“…Chen et al [50] summarized the factors affecting the fatigue damage of the subsea wellhead system qualitatively and quantitatively. Pestana et al [51,52] conducted a theoretical analysis of the recoil response of the riser after emergency detachment using a nonlinear damping-spring model. Mai et al [53,54] presented new modeling of the behavior of an underwater vehicle operating in the littoral sea, and a new simulation method of the full equations of the combined rigid-body motion of an underwater vehicle, and the flexible motion of the umbilical cable was derived.…”

Section: Introductionmentioning

confidence: 99%

Influence of Auxiliary Pipelines of the Deepwater Drilling Riser on the Dynamic Characteristics of the Subsea Wellhead

Wang,

Gao

et al. 2023

JMSE

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During deepwater drilling, the subsea wellhead will be subjected to dynamic loads transmitted from the marine environment, floating drilling platform, riser, and blowout preventer (BOP). Therefore, complex dynamic responses will be induced, which will seriously affect the safety of the subsea wellhead. In this paper, considering the effect of auxiliary pipelines on the riser, a novel entire mechanical model of the floating platform–riser–BOP–subsea wellhead is established. By using the finite-difference method, the governing equations are solved. Finally, the dynamic bending moment and stress distribution of the subsea wellhead are obtained. Moreover, the model is verified by numerical simulation in Orcaflex. On this basis, the influence of the wave height, wave period, sludge height of the subsea wellhead, rotational stiffness of the lower flexible joint, and wall thickness of the conductor on the dynamic characteristics of the subsea wellhead is discussed. Analysis results show that the theoretical analysis results are in good agreement with the numerical simulation. The auxiliary pipelines have important influence on the dynamic characteristics of the subsea wellhead. Wave period is the most important factor affecting the mechanical behavior of the subsea wellhead. Wave height, wall thickness of the conductor, and sludge height are secondary factors affecting the mechanical behavior of the subsea wellhead. The rotational stiffness of the lower flexible joint has little influence on the mechanical behavior of the subsea wellhead. By solving the optimized mechanical model proposed in this paper, the dynamic characteristic of the subsea wellhead conforms more to the actual deepwater drilling conditions. This study has reference significance for the design and mechanical control of the subsea wellhead in deepwater drilling.

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Section: Introductionmentioning

confidence: 99%

Influence of Auxiliary Pipelines of the Deepwater Drilling Riser on the Dynamic Characteristics of the Subsea Wellhead

Wang,

Gao

et al. 2023

JMSE

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“…The TTR is the transmission channel between the wellhead and the platform. The hydro-pneumatic tensioner (HPT) connects the floating platform with the TTR, compensates the platform motion and keeps the necessary tension to prevent TTR buckling [1]. The HPT for the TTR can be classified as the wireline riser tensioner system and the direct-acting tensioner (DAT) system according to the wireline used or not [2].…”

Section: Introductionmentioning

confidence: 99%

Frequency Response Function and Design Parameter Effects of Hydro-Pneumatic Tensioner for Top-Tensioned Riser

et al. 2021

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The top-tensioned riser is an important equipment in offshore oil and gas development. The hydro-pneumatic tensioner is an essential device to ensure the safety of the top-tensioned riser. To investigate the dynamic performance of the marine platform hydro-pneumatic tensioner, this paper proposed a first-order Taylor approximation method and created the frequency response function of the hydro-pneumatic tensioner. According to the frequency response function, the hydro-pneumatic tensioner is a first-order spring-mass system. With the given parameters, the system stiffness coefficient is 66.1 kN/m, the natural annular frequency is 20.99 rad/s and the damping ratio is 2.23 × 10−4. The effects of the high-pressure accumulator, low-pressure accumulator, hydraulic cylinder and pipeline design parameters on the stiffness coefficient, natural annular frequency and damping ratio are analyzed. The stiffness coefficient can be increased by (1) increasing the high-pressure accumulator pressure and reducing the high-pressure accumulator volume; (2) increasing the pressure of the low-pressure accumulator and reducing the low-pressure accumulator volume; (3) increasing the piston diameter; and vice versa. The natural annular frequency can be increased by: (1) increasing the high-pressure accumulator pressure and reducing the high-pressure accumulator volume; (2) increasing the pressure of the low-pressure accumulator and reducing the low-pressure accumulator volume; (3) increasing the piston diameter; and vice versa. The damping ratio can be increased by increasing the pipeline length and reducing the pipeline inner diameter.

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“…Mao et al, (2016Mao et al, ( , 2015 studied the mechanics of marine drilling risers in site and Vortex Induced Vibrations (VIV) as well. Tensioner systems that are relevant for the dynamics of top-tensioned risers have been studied by Guimarães Pestana et al (2016) and Lee et al (2015). Wei et al (2012) employed the experimental method to analyze the hydrodynamic performance of a floating drilling production storage and offloading unit connected to a riser.…”

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confidence: 99%

On the probabilistic distribution of loads on a marine riser

Cabrera-Miranda

Paik

2017

Ocean Engineering

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While in service, marine risers are subjected to various types of loads, such as axial tension and bending moments arising from waves, winds, and currents in association with the motions of the offshore platform. They are also subjected to internal and external pressure loads caused by internal flows and external water pressure. The characteristics of the loads on a marine riser are essentially probabilistic in nature, as they involve several uncertainties associated with random variables. The aim of this study is to quantify the probabilistic distribution of loads on a marine riser to aid determination of the nominal values of design loads. Two methods are investigated. The first is to select a set of credible scenarios in association with site-specific metocean data on an offshore platform, and then perform dynamic riser analysis to describe the probabilistic distribution of the loads. The second is to calculate a metamodel to predict the loads as a function of multiple input variables, a method that can also characterize the probabilistic load distribution by running a Monte Carlo simulation. Both approaches are compared via a numerical example of a marine drilling riser in ultra-deep water; the results show that metamodel-based method is the most appropriate to describe neatly the loads at low probability of exceedance. The characteristics of the loads on a marine riser are observed to be highly random and significantly affected by environmental and functional conditions. Hence, the design loads must be determined by considering the marginal probabilistic density function of all such parameters.

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Marine riser emergency disconnection analysis using scalar elements for tensioner modelling

Cited by 48 publications

References 1 publication

Influence of Auxiliary Pipelines of the Deepwater Drilling Riser on the Dynamic Characteristics of the Subsea Wellhead

Influence of Auxiliary Pipelines of the Deepwater Drilling Riser on the Dynamic Characteristics of the Subsea Wellhead

Frequency Response Function and Design Parameter Effects of Hydro-Pneumatic Tensioner for Top-Tensioned Riser

On the probabilistic distribution of loads on a marine riser

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