Page 189 - Formulas and Calculations for Petroleum Engineering

182 Formulas and calculations for petroleum engineering

Formula(s)

0:3604 kt
t ¼
D 2
∅mc r
t w
Reference: Ramey Jr, H. J. (1981). Reservoir Engineering Assessment of Geothermal Systems. Department of Petroleum
Engineering, Stanford University, Page: (5.7).

3.15 Dimensionless cumulative production (radial flow constant-pressure production)

Input(s)
p i : Initial Reservoir Pressure (psi)
Q p : Flow Rate of Production (STB/day)
B: Volume Factor (RB/STB)
m: Oil Viscosity (cP)
k: Permeability (mD)
r w : Radius of Wellbore (ft)
ø: Porosity (fraction)
c t : Total Compressibility (1/psi)
h: Thickness of Reservoir (ft)
p wf : Well Flowing Pressure (psi)

Output(s)
Q pd : Dimensionless Cumulative Production (dimensionless)

Formula(s)

B
Q ¼ Q
pd p
1:119 ø c h r p p
2
t w i wf
Reference: Lee, J., Rollins, J. B., & Spivey, J. P. (2003). Pressure Transient Testing (Vol. 9). Richardson, Texas: Society of
Petroleum Engineers, Page: 9.

3.16 Dimensionless drawdown correlating parameter by Carter

Input(s)

m gi : Initial Gas Viscosity (cP)
m gavg : Average Gas of Viscosity (cP)
c gi : Initial Gas Compressibility (1/psi)
c gavg : Average Gas Compressibility (1/psi)

Output(s)
l: Dimensionless Drawdown Correlating Parameter (dimensionless).