Skin Factor Due to Reduced Crushed-Zone Permeability Calculator
Enter the required inputs, confirm the units, and run the calculator to solve s_c. Review the formula source and assumptions before using the result in engineering work.
Calculation context and source notes
Skin Factor Due to Reduced Crushed-Zone Permeability calculates skin factor due to reduced crushed-zone permeability for well performance workflows in production engineering. The page keeps the declared variables, units, source relationship, and output definition visible for technical review.
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.
Solves for
s_c (dimensionless)
Best next page
Formula, variables, and sourceFormula, variables, and default calculation
Reproducible default result
With the default values shown below, the calculation returns s_c = 24.953299 dimensionless. Defaults demonstrate the implementation; they are not recommended field values.
100
10
25
30
60
1
0.5
0.25
Input definitions
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
Output definitions
s_c
Skin Factor Due to Reduced Crushed-Zone Permeability
k_dp
Crushed Zone Permeability
N
Total Number of Perforations
Engineering use, assumptions, and limits
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.
Frequently asked questions
What inputs does the Skin Factor Due to Reduced Crushed-Zone Permeability calculator need?
The calculation uses Formation Permeability (k), Crushed Zone Permeability (k_dp), Damage Zone Permeability (k_d), Perforation Interval (h_p), Total Number of Perforations (N), Depth of Penetration (L_p), Crushed Zone Radius (r_dp), Perforation Radius (r_p). Enter values on the units shown beside each field.
What result does this calculator return?
The primary result is skin factor due to reduced crushed-zone permeability in dimensionless. The formula section shows the declared relationship, variables, and a reproducible default calculation.
What should I check before using the result?
Confirm the unit basis, source applicability, and input quality. The calculation does not replace a full engineering model or operating procedure. Mixing unit systems without converting the inputs.
Source and record status
Source metadata identifies the relationship implemented by the calculator. Check the cited edition, unit basis, and scope against the engineering case before operational use.
Joshi, S.D. 1991. Horizontal Well Technology, Page 504.
Open source reference