Page 42 - Formulas and Calculations for Petroleum Engineering

Reservoir engineering formulas and calculations Chapter 1 35

Output(s)

c o : Isothermal Compressibility of Oil (/psi)

Formula(s)
5 Rsob +17:2 T 1180 g +12:61 r 1433
g
c ¼
o 5
p 10
Reference: Applied Petroleum Reservoir Engineering, Second Edition, Craft & Hawkins, Page: 39.

1.78 Isothermal compressibility of oil—Villena-Lanzi correlation—P < Pb

Input(s)
p: Pressure (psi)
p b : Bubble point pressure (psi)
T: Temp (F)
Rsob: Solution oil gas ratio at bubble point (fraction)
r: Density of oil (API)

Output(s)
lc o : Isothermal Compressibility of Oil (/psi)

Formula(s)

ð
lc ¼ 0:664 1:430 ln pðÞ 0:395 ln pðÞ +0:39 ln TðÞ +0:455 ln RsobÞ +0:262 ln rðÞ
o b
Reference: Applied Petroleum Reservoir Engineering, Second Edition, Craft & Hawkins, Page: 39.

1.79 Isothermal compressibility of water—Osif correlation

Input(s)
C NaCl : Salinity (g NaCl/L)
T: Temperature (F)
p: Pressure (psi)

Output(s)

c w : Isothermal Compressibility of Water (Osif Correlation) (SCF/STB)

Formula(s)
1
c ¼
w
7:033 p + 541:5 CNaCl 537:0 T + 403300
Reference: Applied Petroleum Reservoir Engineering, Second Edition, Craft & Hawkins, Page: 46.

1.80 Kerns method for gas flow in a fracture
Input(s)

k: Permeability (mD)
m: Viscosity (cP)
P: Pressure (psi)