Production EngineeringHydraulic Fracturing
Capacity Ratio of Hydraulically Fractured Surface Formula
Capacity Ratio of Hydraulically Fractured Surface calculates fractured surface capacity ratio for hydraulic fracturing workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (k_f, W, k, h) are known and the assumptions behind the cited hydraulic fracturing 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, c_f equals 4 dimensionless.
k_fmD
100000
Wft
0.02
kmD
10
hft
50
Inputs
k_f
mDFracture Permeability
W
ftFracture Thickness
k
mDAverage Formation Permeability
h
ftFormation Thickness
Outputs
c_f
dimensionless
Fractured Surface Capacity Ratio
k_f
mD
Fracture Permeability
W
ft
Fracture Thickness
Source and review
reviewedSaydam, T. 1967. Principles of Hydraulic Fracturing. ARI Publishing Co., Page 92.
Source