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| Relative oil mobility |
| Oil formation volume factor |
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| Relative water mobility |
| Water formation volume factor |
| Current formation pressure | ||||||||||||||||
| crossCross-sectional flow area |
| Total sandface flowrate |
| Deviation of flow from horizontal plane | ||||||||||||||||
| Water density |
| Oil density |
| Standard gravity constant |
It provides a good estimate when the drawdown is much higher than delta pressure from gravity and capillary effects.
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