Entrance Hole Size from Casing Yield Strength Formula
Entrance Hole Size from Casing Yield Strength calculates entrance hole diameter in casing of interest for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (sigma_yr, sigma_y, d_r) 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, d equals 0.358177 in.
80
110
0.42
Inputs
sigma_yr
ksiYield Strength of Reference Casing
sigma_y
ksiYield Strength of Casing of Interest
d_r
inEntrance Hole Diameter in Reference Casing
Outputs
d
Entrance Hole Diameter in Casing of Interest
d_r
Entrance Hole Diameter in Reference Casing
sigma_y
Yield Strength of Casing of Interest
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 50.
Source