Production EngineeringInjection Wells
Waterflood Mobility Ratio Formula
Waterflood Mobility Ratio calculates waterflood mobility ratio for injection wells workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (k_rw, mu_w, k_ro, mu_o) are known and the assumptions behind the cited injection wells 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, M equals 1.836735 dimensionless.
k_rwfraction
0.3
mu_wcP
0.7
k_rofraction
0.7
mu_ocP
3
Inputs
k_rw
fractionRelative Permeability to Water at Residual Oil Saturation
mu_w
cPWater Viscosity
k_ro
fractionRelative Permeability to Oil at Initial Water Saturation
mu_o
cPOil Viscosity
Outputs
M
dimensionless
Waterflood Mobility Ratio
mu_w
cP
Water Viscosity
Source and review
reviewedAAPG Wiki. Waterflooding, mobility ratio definition.
Source