Page 229 - Formulas and Calculations for Petroleum Engineering

222 Formulas and calculations for petroleum engineering

Formula(s)

L
ΔP ¼ 518 ρ 0:79 q 1:79 μ 0:207
f 4:79
1000 D

Reference: Boyun, G., William, C., & Ali Ghalambor, G. (2007). Petroleum Production Engineering: A Computer-Assisted
Approach, Page: 16/246.

4.41 Gas velocity under sonic flow conditions (through choke)

Input(s)

K s : Empirical Gas Constant (ft/s)
ρ l : Liquid Density (g/cc)
ρ g : Gas Density (g/cc)

Output(s)
v: Allowable Gas Velocity (ft/s)

Formula(s)

0:5
!
ρ ρ
v ¼ K l g
ρ g
s
Reference: John M. Campbell, 1992. Gas Conditioning and Processing, Campbell Petroleum Series, Oklahoma, Vol. 2,
Page: 73.

4.42 Hydraulic fracture efficiency
Input(s)

x: Fracture Length (ft)
t: Injection Time (min)
p
ffiffiffiffiffiffiffiffiffi
C: Fracture Liquid Coefficient m= min)
Output(s)

η: Hydraulic Fracture Efficiency (%)

Formula(s)

1 x 2 2x
η ¼ e erfc xðÞ + p 1
x 2 π
ffiffiffi
Z ∞
2 t 2
erfc xðÞ ¼ ffiffiffip e dt
π
x
p ffiffiffiffi
πt
x ¼ 2C
W
Reference: Saydam, T., (1967). Principles of Hydraulic Fracturing, ARI Publishing Co., Page: 23.