8/13/2019 Scanpower Flow Assurance

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Scandpower is a member of the Lloyd’s Register Group

Services are provided by members of the Lloyd’s Register Group.

For further details please see our website: www.lr.org/entities

Learn more about our services-

go to www.scandpower.com - www.riskspectrum.com - www.lr.org

To Scandpower, flow assurance coversissues such as systems regularity, reliability

and risk management, in addition to thetraditional flow assurance issues such astransient multiphase flow simulations andsolids management. Putting all of thistogether, Scandpower can offer a range offlow assurance services that are broad aswell as innovative.

ToolsOLGA® is an industry standard software fortransient multiphase flow simulations. It hasgained its reputation in countless successful

studies of complex developments all aroundthe world.

PVTsim is an industry standard software fordetermining the PVT properties of multicom-ponent systems, primarily hydrocarbon sys-tems. Even in a dynamic world, the propertiesof systems at equilibrium conditions are vitalinformation.

RiskSpectrum® is an industry standard to thenuclear industry. Half of the world’s nuclearpower plants use RiskSpectrum® to managerisk. This is a testimony of RiskSpectrum®’sstability, versatility, and powerfulness. Suitedfor everything from the basic fault tree withAND and OR gates to advanced fault tree andevent tree integration of sequences in linkedevent trees RiskSpectrum® can offer valuablecapabilities in flow assurance studies.

@RISK is a state of the art software for per-forming Monte Carlo simulations. The Monte

FLOW ASSURANCE -Where tradition and innovation meet

Carlo technique uses random numbers to de-scribe and evaluate uncertainty. Today such

simulations are widely used for quantitativedecision support.

Scandpower’s transient subsea gas plumemodel gives a quantitative description of howsubsea gas leakages develop into gas cloudsin the air. By combining the transient gasleakage rate and composition (from OLGA®)with Scandpower’s transient plume model(developed in cooperation with the Norwe-gian University of Science and Technology)input is generated to enable simulation of gas

dispersion in the atmosphere using 3D CFD(Kameleon FireX) ServicesFlow assurance is a core activity duringfiel development and operations. Here aresome questions Scandpower can assist inanswering:• How long does it take to depressurize

the production system ?• Can the system be depressurized to be-

low the hydrate formation pressure atall, simply by opening valves ?

• How will gas lift affect the slug pattern ?• If the platform EV erroneously opens af-

ter phase segregation has taken place ina shut-in riser, will the pressure peak inthe inlet arrangement exceed the designpressure? Or the test pressure?

• How often can it be expected that themethanol injection system fails ? Whatis the single most likely cause of failure ?

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• What is the one modification to the MEGsystem that will have the greatest effect

in terms of reducing the hydrate forma-tion risk ?

• How long can the subsea system beshut-in before it enters conditions favor-able for hydrate formation ?

• What is the consequence of choke col-lapse during normal production andstart-up with respect to maximum al-lowable pressure in the inlet arrange-ment/separator ? Will test pressure beexceeded ?

• How fast does a primary barrier (EV)

need to close to avoid overpressurisingthe inlet arrangement/separator uponerroneous opening of EV when topsidechoke is fully open ?

• How will the topside choke opening af-fect the slug pattern ?

• What insulation thickness is sufficient inorder to keep fluid temperature abovehydrate formation temperature duringnormal production?

• Will the platform of the drilling rig be ex-posed to flammable gas in case of a sub-sea riser leakage or a subsea blow out?

• Is it possible to detect a leak in a gas liftvalve from pressure measurements in acooling annulus?