Reservoir EngineeringPermeability
Klinkenberg Apparent Gas Permeability Formula
Klinkenberg Apparent Gas Permeability calculates apparent gas permeability for permeability workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (k_l, b, p) are known and the assumptions behind the cited permeability 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_g equals 120 mD.
k_lmD
100
batm
10
patm
50
Inputs
k_l
mDLiquid or Intrinsic Permeability
b
atmKlinkenberg Slip Factor
p
atmMean Flowing Gas Pressure
Outputs
k_g
mD
Apparent Gas Permeability
k_l
mD
Liquid or Intrinsic Permeability
b
atm
Klinkenberg Slip Factor
p
atm
Mean Flowing Gas Pressure
Source and review
reviewedKlinkenberg, L.J. 1941. The permeability of porous media to liquids and gases. API Drilling and Production Practice.
Source