Reservoir EngineeringPermeability and Flow
Corey Oil Relative Permeability Formula
Corey Oil Relative Permeability calculates oil relative permeability for permeability and flow workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (k_ro_end, S_wn, n_o) 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_ro equals 0.225 dimensionless.
k_ro_enddimensionless
0.9
S_wnfraction
0.5
n_odimensionless
2
Inputs
k_ro_end
dimensionlessEndpoint Oil Relative Permeability
S_wn
fractionNormalized Water Saturation
n_o
dimensionlessCorey Oil Exponent
Outputs
k_ro
dimensionless
Oil Relative Permeability
k_ro_end
dimensionless
Endpoint Oil Relative Permeability
S_wn
fraction
Normalized Water Saturation
n_o
dimensionless
Corey Oil Exponent
Source and review
reviewedPetroleum Office. Corey and LET Relative Permeability Models.
Source