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The table below is summarizing the major differences between SS and PSS regimes.
| Steady state regime (SS) | Pseudo-steady state (PSS) | ||||||
|---|---|---|---|---|---|---|---|
| Boundary | Full pressure support | No pressure support | |||||
| Productivity index (PI) |
| constant | constant | ||||
| Flowrate |
| constant | constant | ||||
| constant | constant | |||||
| Botomhole pressure (BHP) |
| constant | varying | ||||
| Formation pressure |
| constant | varying |
It's again important to avoid confusion between the termines stationary conditions (which mean that refered properties are not chaning in time) and stabilised flow conditions which may admit pressure and rate vraitionvariation.
See Also
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Physics / Mechanics / Continuum mechanics / Fluid Mechanics / Fluid Dynamics