Severe Subsea Riser Slugging (Bøe Criterion) Calculator
Determine whether a subsea pipeline-riser system will experience severe cyclic hydrodynamic slugging using the Bøe stability criterion and choke valve pressure drop.
Pipeline & Riser Dimensions
Slugging Dynamics & Stability
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Frequently Asked Questions
What is severe riser slugging in offshore oil and gas production?
Severe slugging is an unstable cyclic terrain phenomenon where liquid accumulates at a downward-sloping riser base. As liquid blocks gas flow, a dense liquid column fills the vertical riser until upstream gas compresses sufficiently to blow the massive liquid slug violently into topsides separators.
What is the Bøe stability criterion?
Proposed by Morten Bøe, the dimensionless parameter compares the gas volume expansion capacity in the upstream flowline against the hydrostatic liquid head of the riser. When Π > 1.0, gas can continuously lift liquid without cyclic blockage.
How does topsides choking eliminate severe riser slugging?
Throttling the topsides choke valve increases backpressure, reducing the relative compressibility of the upstream gas pocket and suppressing flow oscillations into smooth steady multiphase flow.