Reservoir EngineeringPermeability and Flow
Relative Permeability from Effective Permeability Formula
Relative Permeability from Effective Permeability calculates relative permeability for permeability and flow workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (k_eff, k_abs) 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_r equals 0.3 dimensionless.
k_effmd
60
k_absmd
200
Inputs
k_eff
mdEffective Permeability to the Flowing Phase
k_abs
mdAbsolute Permeability
Outputs
k_r
dimensionless
Relative Permeability
k_eff
md
Effective Permeability to the Flowing Phase
k_abs
md
Absolute Permeability
Source and review
reviewedDrillingFormulas.com. Effective and Relative Permeability.
Source