Production EngineeringWell Performance
Shape Factor Expressed as Skin Factor for Vertical Wells Formula
Shape Factor Expressed as Skin Factor for Vertical Wells calculates shape-related skin factor for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (C_A) are known and the assumptions behind the cited well performance 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_CA equals 0.026296 dimensionless.
C_Adimensionless
30
Inputs
C_A
dimensionlessShape Factor
Outputs
s_CA
dimensionless
Shape-Related Skin Factor
C_A
dimensionless
Shape Factor
Source and review
reviewedJoshi, S.D. 1991. Horizontal Well Technology, Chapter 7, Page 208.
SourceRelated formulas and calculators
Effective Wellbore Radius of a Well in Presence of Uniform Flux Fractures
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Effective Wellbore Radius of a Horizontal Well – Method 1 (Anisotropic Reservoirs)
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Effective Wellbore Radius of a Horizontal Well – van der Vlis et al. Method
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