Skin Factor Due to Reduced Crushed-Zone Permeability Formula
Skin Factor Due to Reduced Crushed-Zone Permeability calculates skin factor due to reduced crushed-zone permeability for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (k, k_dp, k_d, h_p, N, L_p, r_dp, r_p) 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_c equals 24.953299 dimensionless.
100
10
25
30
60
1
0.5
0.25
Inputs
k
mDFormation Permeability
k_dp
mDCrushed Zone Permeability
k_d
mDDamage Zone Permeability
h_p
ftPerforation Interval
N
countTotal Number of Perforations
L_p
ftDepth of Penetration
r_dp
ftCrushed Zone Radius
r_p
ftPerforation Radius
Outputs
s_c
Skin Factor Due to Reduced Crushed-Zone Permeability
k_dp
Crushed Zone Permeability
N
Total Number of Perforations
Source and review
reviewedJoshi, S.D. 1991. Horizontal Well Technology, Page 504.
Source