Analysis of Fluid-Solid Coupling Characteristics of Oil and Gas Submarine Span Pipelines

Ridong, Bao

doi:10.1061/(asce)ps.1949-1204.0000152

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…Kheiri et al [24] investigated a fluid conveying pipe with flexible end restraints but did not account for a confined external fluid. Bao [25] studied submerged fluid conveying pipes on elastic supports but did not investigate damping to a significant degree.…”

Section: Figure 1 Modified Well Configurationmentioning

confidence: 99%

Damping of a fluid-conveying pipe surrounded by a viscous annulus fluid

Kjolsing

Todd

2017

Journal of Sound and Vibration

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To further the development of a downhole vibration based energy harvester, this study explores how fluid velocity affects damping in a fluid-conveying pipe stemming from a viscous annulus fluid. A linearized equation of motion is formed which employs a hydrodynamic forcing function to model the annulus fluid. The system is solved in the frequency domain through the use of the spectral element method. The three independent variables investigated are the conveyed fluid velocity, the rotational stiffness of the boundary (using elastic springs), and the annulus fluid viscosity. It was found that, due to the hydrodynamic functions frequency-dependence, increasing the conveyed fluid velocity increases the systems damping ratio. It was also noted that stiffer systems saw the damping ratio increase at a slower rate when compared to flexible systems as the conveyed fluid velocity was increased. The results indicate that overestimating the stiffness of a system can lead to underestimated damping ratios and that this error is made worse if the produced fluid velocity or annulus fluid viscosity is underestimated. A numeric example was provided to graphically illustrate these errors. Approved for publication, LA-UR-15-28006.

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Section: Figure 1 Modified Well Configurationmentioning

confidence: 99%

Damping of a fluid-conveying pipe surrounded by a viscous annulus fluid

Kjolsing

Todd

2017

Journal of Sound and Vibration

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“…An active transmission piping network forms the heart of water, oil and natural gas transportation systems (Bao, 2015). A substantial share of the energy and water requirements of nations is transported through pipelines; consequently, many regions are economically linked to the flow and continuous operation of these systems (Al-Khalil et al , 2005; El-abbasy et al , 2014).…”

Section: Introductionmentioning

confidence: 99%

Construction material supply risk management using Asian option contracts: the case of a pipeline project

Vahdatmanesh

Firouzi

2020

ECAM

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PurposeSteel price uncertainty exposes pipeline projects that are inherently capital intensive to the risk of cost overruns. The current study proposes a hedging methodology for tackling steel pipeline price risk by deploying Asian option contracts that address the shortcomings of current risk mitigation strategies.Design/methodology/approachA stepwise methodology is introduced, which uses a closed-form formula as an Asian option valuation method for calculating this total expenditure. The scenario analysis of three price trends examines whether or not the approach is beneficial to users. The sensitivity analysis then has been conducted using the financial option Greeks to assess the effects of changes in volatility in the total price of the option contracts. The total price of the Asian options was then compared with those of the European and American options.FindingsThe results demonstrate that the Asian option expenditure was about 1.87% of the total cost of the case study project. The scenario analysis revealed that, except for when the price followed a continuous downward pattern, the use of this type of financial instrument is a practical approach for steel pipeline price risk management.Practical implicationsThis approach is founded on a well-established financial options theory and elucidates how pipeline project participants can deploy Asian option contracts to safeguard against steel price fluctuations in practice.Originality/valueAlthough the literature exists about the theory and application of financial derivative instruments for risk management in other sectors, their application to the construction industry is infrequent. In the proposed methodology, all participants involved in fixed price pipeline projects readily surmount the risk of exposure to material price fluctuations.

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