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Deepwater Field Development - Flow Assurance - Dynamic ...

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Black Oil System: Cold Restart<br />

• System pressure < hydrate formation conditions throughout<br />

restart?<br />

• For deepwater, hydrostatic pressure in riser too high<br />

• Separator pressure: may need alternate start-up vessel<br />

• Hydrate inhibition required until arrival temperature reaches<br />

“Safe Operating Temperature” (SOT)<br />

• Maintain hydrate inhibitor rate: Fluid completely inhibited<br />

• Reduce hydrate inhibitor rate: Fluid not completely inhibited to<br />

shut-in conditions<br />

• SOT is minimum topsides temperature that provides<br />

sufficient cooldown time, in the event of an interrupted restart

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