Page 235 - Formulas and Calculations for Petroleum Engineering
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228 Formulas and calculations for petroleum engineering
4.56 Perforation friction pressure
Input(s)
3
Q: Flow Rate (m /min)
ρ: Fluid Density (kg/L)
n: Number of Perforations (unitless)
D p : Diameter of Perforation (cm)
C: Perforation Coefficient (0.6–1.0) (unitless)
Output(s)
ΔP pf : Perforation Friction Pressure (MPa)
Formula(s)
Q ρ
2
ΔP ¼ 22:335
pf 2 2 4
n C D
p
Reference: Daneshy, A. 2013. Fundamentals of Hydraulic Fracturing, Daneshy Consultants International, Page: 93.
4.57 Perforation hole size (perforation)
Input(s)
x: Brinell Hardness of Casing of Interest (dimensionless)
d r : Entrance Hole Diameter in Reference Casing (in.)
x r : Brinell Hardness of Reference Casing (dimensionless)
Output(s)
d: Entrance Hole Diameter in Casing of Interest (in.)
Formula(s)
0:5
½ 2;250 + 4:2x
r
d ¼ d r
½ 2;250 + 4:2x
Reference: Bell, W. T., Sukup, R. A., & Tariq, S. M. (1995). Perforating. Henry L. Doherty Memorial Fund of AIME, Society
of Petroleum Engineers., Page: 50.
4.58 Perforation length in formation
Input(s)
L pr : Total Target Penetration in Reference Target (in.)
d wb : Wellbore Diameter (in.)
d ci : Casing Inner Diameter (in.)
Output(s)
L p : Total Target Penetration in Formation of Interest (in.)
