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The simplest way to model the watercut Yw in a given well is the Watercut (Yw) Fractional Flow @model:
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{\rm Y_{wm}} = \frac{1}{1 + \frac{M_{ro}}{M_{rw}} \cdot \frac{B_w}{B_o} } = \frac{1}{1 + \frac{k_{ro}}{k_{rw}} \cdot \frac{\mu_w }{\mu_o } \cdot \frac{B_w}{B_o}} |
which provides a good estimate when the drawdown is much higher than delta pressure from gravity and capillary effects.
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