9 CFD in Subsea Prod

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Public 2012 Aker Solutions Preferred partner

Preferred partner

CFD in Subsea Production SystemsStavanger 24 October 2012Arnout Klinkenberg


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Computational Fluid Dynamics

Basic solving:

Mass equation (continuity) Impulse equation (velocities & pressure, Navier-Stokes)

Thermal equation

Additional modelling:

Turbulence Species transport, including reacting flows

Buoyancy

Multiple phases, including phase change Bubbles

Free surface flow

Particles

Radiation

Fluid-structure interaction

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Sand particles in the production liquid will result in pipe wall erosion

DNV provides a method of erosion calculations: RP O501 Erosion Wear in Piping Systems

Erosion rate curve based on measurements:

Sand erosion


1) Graph is taken from RP O501

1)


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Sand erosion

Programme ERBEND calculate erosion rates, based on measurements in

standard components:

In general, bends are showing high erosion rates. Bends can be replaced by

a blinded Tees.

Assumption: Long straight pipe upstream component to have a nice velocity

and sand distribution

This assumption is not always correct


1) Pictures are taken from RP O501

1)


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Subsea XMT Flow loop


Flow


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Subsea XMT Flow control module


Choke

MPFMMPFM

Flow

Choke


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Model

The fluid properties of the

production liquid are calculatedwith HYSYS

The maximum production

velocity is used as boundary

condition on the inlet

Turbulence is modelled (SST)

The flow is steady

Sand particles are injected

through the inlet

Effect of turbulence onparticles is modelled



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Calculation mesh

Velocity, pressure, turbulence

and particle concentration iscalculated on every mesh point

in the flow loop

Mass, impulse and energy

balance

Special care for mesh close tothe wall



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Results XMT Flow loop


The production fluid velocity of

the flow loop A plot is made of the flow path

of the sand particles

The flow path is coloured with

the velocity of the particles

Velocity on a cut plane

Bend: particles flow to outside

Blinded T: Velocity reduction


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Erosion rates flow loop

22 October, 2012Slide 11Date Month 2012

Kristin flowloop erosion

Slide 11

Blinded T

Bend

Erosion rates compared

with standard DNV model:

Blinded Tee one: same

Blinded Tee two: higher

Bend: higher

Sensor: not in DNV model

Sensor


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Erosion rates flow control module



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Subsea dead end


Dead leg used for future tie-in.

Hydrate risk due to cooling from sea water. Flow model is made to see temperature of the dead end is heated

up by recirculation zone. Two options:

Future tie-in (MEG)

Water: 4CHTC = 500 W/m2K

Recirculation dead end

Fluid

flow

Valve

Water: 4C

HTC = 500 W/m2KRecirculation dead end

Fluid flow

Valve

Normal production case

Future tie-in production case


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A CFD model is made and pressure, flow, turbulence and energy

equations are solved in the fluid and in the solid. For the normal production case, the temperature is above 20C.

Subsea dead end temperature


Flow


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The same model is used to calculate the future tie-in case. Recirculation is small

Temperature below 20C are plotted.

Subsea dead end temperature


Flow


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Questions?



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9 CFD in Subsea Prod

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