Reservoir EngineeringPermeability and Flow
Normalized Water Saturation for Relative Permeability Formula
Normalized Water Saturation for Relative Permeability calculates normalized water saturation for permeability and flow workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (S_w, S_wi, S_or) 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, S_wn equals 0.545455 fraction.
S_wfraction
0.5
S_wifraction
0.2
S_orfraction
0.25
Inputs
S_w
fractionWater Saturation
S_wi
fractionIrreducible Water Saturation
S_or
fractionResidual Oil Saturation
Outputs
S_wn
fraction
Normalized Water Saturation
S_w
fraction
Water Saturation
S_wi
fraction
Irreducible Water Saturation
S_or
fraction
Residual Oil Saturation
Source and review
reviewedPetroleum Office. Corey and LET Relative Permeability Models.
Source