Reservoir EngineeringPermeability and Flow
Corey Water Relative Permeability Formula
Corey Water Relative Permeability calculates water relative permeability for permeability and flow workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (k_rw_end, S_wn, n_w) 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, k_rw equals 0.0375 dimensionless.
k_rw_enddimensionless
0.3
S_wnfraction
0.5
n_wdimensionless
3
Inputs
k_rw_end
dimensionlessEndpoint Water Relative Permeability
S_wn
fractionNormalized Water Saturation
n_w
dimensionlessCorey Water Exponent
Outputs
k_rw
dimensionless
Water Relative Permeability
k_rw_end
dimensionless
Endpoint Water Relative Permeability
S_wn
fraction
Normalized Water Saturation
n_w
dimensionless
Corey Water Exponent
Source and review
reviewedPetroleum Office. Corey and LET Relative Permeability Models.
Source