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| Water formation volume factor |
| Oil formation volume factor |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Relative water mobility |
| Relative oil mobility |
| Current formation pressure | ||||||||||||||||
| Water density |
| Oil density |
| Standard gravity constant | ||||||||||||||||
| Total sandface flowrate |
| Cross-sectional flow area |
| Deviation of flow from horizontal plane | ||||||||||||||||
| capillary pressure |
If saturation does not vary along the flow substantially then capillary effects are vanishing
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If flow is close to horizontal then gravity effects are vanishing too
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In these cases If drawdown is much higher than delta pressure from gravity and capillary effects then
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