Production EngineeringHydraulic Fracturing
Equivalent Skin Factor in Fractured Wells Formula
Equivalent Skin Factor in Fractured Wells calculates equivalent fracture skin factor for hydraulic fracturing workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (x_f, r_w) 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, S_f equals -5.291465 dimensionless.
x_fft
100
r_wft
0.25
Inputs
x_f
ftFracture Half Length
r_w
ftWellbore Radius
Outputs
S_f
dimensionless
Equivalent Fracture Skin Factor
x_f
ft
Fracture Half Length
r_w
ft
Wellbore Radius
Source and review
reviewedGuo, B., Lyons, W.C. and Ghalambor, A. 2007. Petroleum Production Engineering: A Computer-Assisted Approach, Page 17/257.
Source