Water Cut - Stiles Formula
Water Cut - Stiles calculates water cut for waterflooding and eor workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (k, h, M_wo, k_t, h_t) are known and the assumptions behind the cited waterflooding and eor 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, f_w equals 0.421053 fraction.
100
20
2
150
50
Inputs
k
mDBreakthrough-Layer Permeability
h
ftCumulative Thickness for Breakthrough Layer and Above
M_wo
fractionWater-Oil Mobility Ratio
k_t
mDAverage Permeability for the Whole Model
h_t
ftTotal Model Thickness
Outputs
f_w
Water Cut
M_wo
Water-Oil Mobility Ratio
k
Breakthrough-Layer Permeability
h
Cumulative Thickness for Breakthrough Layer and Above
k_t
Average Permeability for the Whole Model
h_t
Total Model Thickness
Source and review
reviewedEnhanced Oil Recovery, Ehrlich, R. (2016)
Ehrlich, R. 2016. Enhanced Oil Recovery, Lecture Notes.