... Abstract Periodically on semi-submersibles, it is required to perform planned and occasionally unplanned disconnects of the marine riser from the subsea BOP stack. The reasons are diverse but always result in a change out of fluids in the riser. Typical circumstances for riser disconnects...

... Abstract In the event of a deep water emergency disconnection, the sudden release of the Lower Marine Riser Package (LMRP) connector can cause the riser string to reach destructive velocities and displacements. Impact between the outer barrel of the telescoping joint and the diverter housing...

... Large Amplitude Motions of Deepwater Marine Riser Transporting Fluid Karun Klaycham, Chainarong Athisakul, Somchai Chucheepsakul Department of Civil Engineering, Faculty of Engineering, King Mongkut s University of Technology Thonburi Bangmod, Thungkhru, Bangkok, Thailand ABSTRACT This paper...

... von-mise equivalent stress wave height installation equation frequency surface tide velocity surface wind velocity installation window riser fleet angle dynamic load lateral vibration wave period vibration analysis sea surface wind velocity marine riser upstream oil & gas...

... Abstract Marine riser is a key equipment connecting subsea wellhead and sea-surface platform (ship). In Subsea Production Tree (SPT) complex installation process, the marine riser hanging to floating drilling platform (ship) on free hanging state, waiting to be moved from the sea-surface...

... ABSTRACT A numerical simulation of VIV characteristics for an actual size marine riser (342.9 m in length and 0.5334 m in diameter) in uniform (V=0.8 m/s) and linearly sheared (V=0.1~1.5 m/s) currents is presented by using a FSI approach which was ever well validated (Wang, et al, 2011...

... reconstruction artificial intelligence frequency Prony-based Method for Time-frequency Analysis of Marine Riser VIV Data 1. Department of Ocean Engineering, Ocean University of China, Qingdao, Shandong, China 2. Department of Ocean Engineering, University of Rhode Island, Narragansett, Rhode Island, USA 3...

... determination of design basis flow rates and verification of operating procedures. In our case we define the maximum unconstrained fluid efflux rate as that resulting from unconstrained gas migration through sea water filled 19 7/8" id marine riser with no pipe in the hole. Yielding [ 7 ]: Gas migration...

... ABSTRACT: A three dimensional vortex-induced-vibration (VIV) fluid-structureinteraction (FSI) simulation for a 500-m-long marine riser is presented in this paper. The simulations were implemented by solving the unsteady Reynolds Navier-Stokes equations and the k-ω turbulence model coupling...

... ABSTRACT A variational formulation of an extensible marine riser is formulated based on the work-energy principle. The total unstretched arc-length of marine riser is specified while the top tension is not yet exactly known at the equilibrium position. A Lagrange multiplier is introduced...

... ABSTRACT We can study the stress behaviour of marine riser based on magnetic anisotropy detection methods of inverse magnetostriction effect, using mixture of experimental and numerical simulation, gives out the relationship between permeability and stress. Meanwhile, through investigating...

... ABSTRACT The present paper discusses an experimental technique to measure the correlation length related to typical flexible model of marine riser. The relative correlation coefficient and correlation length were compared for rigid and flexible cylinders. The results show that for each...

... This paper presents the influence of fluid transportation on dynamic properties of three-dimensional extensible marine riser. The interaction between the transported fluid inside the extensible riser and the riser itself is thoroughly addressed. The large strain model formulation...

... ABSTRACT: The marine risers are generally used as the main transport means for economic materials and resources discovered undersea. In general, the marine risers are secured at either an offshore platform or a vessel. Both ends of the riser are to be adjusted to obey with the design criteria...

... ABSTRACT: In the paper, we present the application of IDA-PBC (Interconnection and Damping Assignment Passivity-Based Control) method to a marine riser control. In reentry operations, it is required to move the riser's lower end to a seabed manifold smoothly as soon as possible. In the motion...

... ABSTRACT A comparison of time domain and frequency domain analysis of a flexible marine riser undergoing large deformations by using a lumped mass approach is described in this paper. The riser is modeled as a set of lumped masses connected by axial springs with a structural axial damping...

... shielding has a siginicant impact on deepwater marine riser design, particularly in the context of wake induced oscillation and ensuing riser clashing. Its effects are not well understood, nor have these effects been investigated thoroughly. In the present study, a computational investigation into the wake...

... ABSTRACT The equations of motion for a marine riser undergoing large deflections and rotations are derived using a modal discretization approach Shear effects based on nonlinear elastic theory are included In the formulation. The dynamic response of a typical marine riser system...

... riser spectrum marine riser sea surface elevation simulation directional spectra upstream oil & gas spectra phase angle frequency principal direction angular distribution independent wave incidence platform equation stress rao matrix ABSTRACT In this paper...

... Abstract The internal fluid dynamic and other conventional forces are described completely in the governing equation of the lateral vibration of a marine riser. The current scope of work is to determine the natural frequency and the mode shape of an undamped riser. With proper tension...