Oil-Well Perforation Pressure Drop Formula
Oil-Well Perforation Pressure Drop calculates pressure drop across perforations for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (q_o, N_perf, mu_o, B_o, L_p, k_pd, r_p, r_pd, rho_o) 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, DeltaP_p equals 132.783802 psi.
500
40
1.2
1.2
0.5
100
0.02
0.25
50
Inputs
q_o
bbl/dayOil Flow Rate Through Perforations
N_perf
countNumber of Perforations
mu_o
cPOil Viscosity
B_o
bbl/STBOil Formation Volume Factor
L_p
ftPerforation Length
k_pd
mDPerforation Damaged-Zone Permeability
r_p
ftPerforation Radius
r_pd
ftPerforation Damaged-Zone Radius
rho_o
lbm/ft^3Oil Density
Outputs
DeltaP_p
Pressure Drop Across Perforations
Source and review
reviewedBell, W.T., Sukup, R.A., and Tariq, S.M. Perforating, Henry L. Doherty Memorial Fund of AIME, SPE, Page 61.
Source