Page 223 - Formulas and Calculations for Petroleum Engineering

216 Formulas and calculations for petroleum engineering

Output(s)

d: Entrance Hole Diameter in Casing of Interest (in.)

Formula(s)

0:5
!
σ
d ¼ yr d
σ y r
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.

4.27 Equivalent skin factor in fractured wells
Input(s)

x f : Fracture Half Length (ft)
r w : Wellbore Radius (ft)

Output(s)

S f : Equivalent Skin (unitless)

Formula(s)

x f
S ¼ 0:7 ln
f
r
w
Reference: Boyun, G., William, C., & Ali Ghalambor, G. (2007). Petroleum Production Engineering: A Computer-Assisted
Approach, Page: 17/257.

4.28 Filter cake on the fracture (acidizing)
Input(s)
1/2
C w : Fluid Loss Coefficient, (m/s )
p ffiffi 1/2
t: Time root (s )

Output(s)

v N : Fluid Loss Velocity (m/s)

Formula(s)

C w
v ¼ p
N ffiffi
t
Reference: Williams, B. B., Gidley, J. L., & Schechter, R. S. (1979). Acidizing fundamentals. Henry L. Doherty Memorial
Fund of AIME, Society of Petroleum Engineers of AIME, Page: 41.