This study investigates vortex-induced vibration dynamic responses of a marine riser transporting internal flow under the action of axial harmonic tension by means of finite element method. A van der Pol wake oscillator is adopted to represent the fluctuating lift forces, and nonlinear hydrodynamic force is also introduced. The goal of …

Drilling fluids range from relatively incompressible fluids, such as water and brines, to very compressible fluids, such as air and foam. Fluid mechanics problems range from the simplicity of a static fluid to the complexity of dynamic surge pressures associated with running pipe or casing into the hole. This page first presents a general ...

DYNAMIC ANALYSIS FOR AN INTERNALLY COUPLED FLUID/RISER SYSTEM * Technip, Houston, TX, USA ** Massachusetts Institute of Technology, Cambridge, MA, USA ABSTRACT Risers are fluid conduits from subsea equipment to surface floating production platforms. The integrity of a riser system plays a very important role in deepwater …

This work aims at compiling the important works on the modeling of a fluid catalytic cracking (FCC) riser reactor. The modeling of a riser reactor is very complex due to complex hydrodynamics and unknown multiple reactions, coupled with mass transfer resistance, heat transfer resistance and deactivation kinetics. A complete model of the …

Bonded flexible hoses used in dynamic, shallow water production riser application. Built according to the API 17K standard. Please choose your country or region.

Riser dynamics. This example verifies the response of a riser under different types of load conditions. Pipelines extending from the sea floor to the ocean surface (risers) are subject to many types of load: self-weight, …

Fig. 1 (a) shows a typical drilling riser stack-up in the event of an emergency disconnection. The riser system consists a pipe of length L, density ρ r, modulus of elasticity E and mass per unit length m p.The external and internal diameters of the pipe are D e and D i respectively which are relatively small compared to the pipe length. The …

Fluid paths are tortuous at low fluid velocities but straight at high fluid velocities. Particle drag forces are mainly around 0.7–0.8 times particle weights. The effects of pressures on flow dynamics in the SCWCFB riser can be ascribed to the changes in density and viscosity of supercritical water, affecting the ability of fluid to carry ...

In this study the dynamic characteristics and stability of a flexible riser, under consideration of its internal flow and, particularly, non-uniform axial tension, are …

Combining (1), (2) and (3) the power gained by the fluid from a pump or fan can be expressed as: P = ρ Q g h (4) With specific weight expressed as: γ = ρ g (5) where. γ = specific weight (N/m3) equation (4) can be modified so the power gained by the fluid from a pump or fan can be expressed as: P = γ Q h (6)

INTRODUCTION. A riser is a fluid conduit from subsea equipment to the surface floating production system such as a Spar or TLP. It is a key component in a deepwater drilling …

Nowadays, the research on lazy wave riser has drawn more attention. Taking the maximum dynamic stress, fatigue life, engineering cost and buoyancy section parameters as optimization objectives, Tanaka et al. (2006), Pina et al. (2011), Yang et al. (2012) and Ai et al. (2019) adopted genetic algorithm, particle swarm optimization …

The 6th International Conference on Power and Energy System Engineering, Okinawa, Japan (2019). (Advisor) Top downloaded paper 2018-2019 in Asia-Pacific Journal of Chemical Engineering certificate from Computational fluid dynamics simulation of system hydrodynamics in a riser of stage circulating fluidized bed reactor.

Section snippets Model of flexible riser carrying slug flows. In a fixed global Cartesian (X–Y) system, Fig. 1 displays a schematic model of an inclined curved flexible riser carrying slug liquid–gas flows which travel upwardly from the pipe bottom connection (inlet) to the top stationary support (outlet) as the coordinate origin.Typical …

Dynamic Power Fluid Riser Dynamic Advanced Fluid Power, Inc Dynamic is a leader in the hydraulics industry with a quality line of valves, pumps, motors, and various other hydraulic components AFP carries a vast line of Dynamic products from all of the series listed below We can also offer options for repairs, reman, and aftermarket ...

Larger displacement of drilling fluid demands greater working power of the subsea lifting pump, which is characterized by a nonlinear relationship. ... if a riser is adopted during operation, riser length must grow with increasing water depth, yielding a heavy and cumbersome structure, especially for the upper riser, which must bear a …

Hybrid Riser incorporated steel and flexible pipe technologies this allows the flexible pipe to absorb most of the dynamic motions of the riser while the Steel Catenary Riser or vertical leg is …

The present work is associated with Circulating Fluidized Bed (CFB) technology, related to the energy sector. The applications of CFB technology span across wide range of areas i.e. boiler, gasifier, combustor, dryer, etc. In the present paper, CFD simulations using ANSYS-Fluent 14.5 were performed to study the effect of novel swirling …

While the internal fluid density is increased, the VIV dynamics of the flexible riser at nodes 10, 30, 50, 70 and 90 with different internal fluid densities ρ i is also demonstrated in Fig. 32, Fig. 33, Fig. 34, Fig. 35. Obviously, multi-frequency response is captured with various internal fluid densities.

Riser conveying fluid is one category in a wide research area known as moving continua dynamic that was the subject to many research studies in the past 50 yr. The structure investigated in this paper is assumed to be a flexible pipe having a geometry of a simple catenary with a buoyancy force at the top. The riser is modeled as a beamlike ...

The fluid is specially formulated to provide yield points of 9 cps to 16 cps, when cut back to 11.0 ppg with seawater. This is a cut back of 2 bbl of seawater to 1 bbl of base fluid. This method of blending the fluid with seawater or pad fluid, while drilling with mud weights from 8.55 ppg to 16.0 ppg, results in:

Riser conveying fluid is one category in a wide research area known as moving continua dynamic that was the subject to many research studies in the past 50 …

Mud is usually a non-Newtonian fluid, while seawater is a Newtonian fluid. Power-law fluid is used to describe mud in this paper. The hydraulic diameter of the concentric annulus is (Erge et al., 2015): (18) D hy = D o − D i where D o is the inside diameter of the riser, D i is the outside diameter of the drill stem.

internally coupled fluid/ riser system. This paper first presents a theoretical formulation for a general riser system coupled with fluids in the annuli and centralizers between pipes. …

all fluids (liquids and gas), controls, and power are transferred safely from the geostationary parts (i.e., wells, flowlines, manifolds, and risers) to the rotating vessel and its process plant under any environmental conditions in the field. OneSubsea can engineer, produce, and deliver swivel stacks and fluid transfer systems to FPSOs and FSOs

Abstract. As oil and gas industry is developing towards deeper ocean area, the length and flexibility of ocean risers become larger, which may induce larger-amplitude displacement of flexible riser response due to lower structural stiffness against environmental and operational loads. Moreover, suffering not only the external fluid …

Fluid Dynamic Loading on Curved Riser Pipes. In order to gain a preliminary understanding of the fluid dynamics developed past a curved riser pipe, a numerical …

Risers are fluid conduits from subsea equipment to surface floating production platforms. The integrity of a riser system plays a very important role in deepwater developments. Riser dynamic analysis is an important part to the system design. This paper investigates riser dynamic analysis using the WKB-Based dynamic stiffness method.

Dynamic Responses of Marine Risers/Pipes Transporting Computational Fluid Dynamics Fluids Flow Assurance and. This paper deals with the dynamic responses to top end excitation of marine risers/pipes conveying internal flu The marine riser is often used as a flexible link between undersea bore head and subsurface offshore platform The tidal …