Calculation of Fractional Flow Curve Formula
Calculation of Fractional Flow Curve calculates fraction of total flowing stream composed of water for permeability and flow workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (mu_w, mu_o, k_rw, k_ro) are known and the assumptions behind the cited permeability and flow relationship match the engineering case being checked.
Assumptions
- Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
- The declared units match the field-unit constants used in the formula.
- The cited formula applies to the selected petroleum engineering workflow.
Limitations
- The calculation does not replace a full engineering model or operating procedure.
- Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.
Common mistakes
- Mixing unit systems without converting the inputs.
- Using default example values as field recommendations.
- Applying the formula outside the source assumptions.
Default example
Using the default inputs, f_w equals 0.681818 dimensionless.
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Inputs
mu_w
cPWater Viscosity
mu_o
cPOil Viscosity
k_rw
dimensionlessRelative Permeability to Water
k_ro
dimensionlessRelative Permeability to Oil
Outputs
f_w
Fraction of Total Flowing Stream Composed of Water
mu_w
Water Viscosity (rearranged)
mu_o
Oil Viscosity (rearranged)
k_rw
Relative Permeability to Water (rearranged)
k_ro
Relative Permeability to Oil (rearranged)
Source and review
reviewedCraig Jr. F. F. (2004). The Reservoir Engineering Aspects of Waterflooding, Vol. 3. SPE Monograph Series, Page: 112.
Source