Production EngineeringWell Performance
Perforation Length in Formation Formula
Perforation Length in Formation calculates total target penetration in formation of interest for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (L_pc, d_wb, d_ci) 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, L_p equals 16.9 in.
L_pcin
18
d_wbin
8.5
d_ciin
6.3
Inputs
L_pc
inTotal Target Penetration in the Reference Target
d_wb
inWellbore Diameter
d_ci
inCasing Inner Diameter
Outputs
L_p
in
Total Target Penetration in Formation of Interest
L_pc
in
Total Target Penetration in the Reference Target
d_wb
in
Wellbore Diameter
d_ci
in
Casing Inner Diameter
Source and review
reviewedBell, W.T., Sukup, R.A., and Tariq, S.M. 1995. Perforating. Henry L. Doherty Memorial Fund of AIME, Society of Petroleum Engineers, Page 52.
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