Page 191 - Formulas and Calculations for Petroleum Engineering

184 Formulas and calculations for petroleum engineering

B: Volume Factor (RB/STB)
m: Oil Viscosity (cP)
k: Permeability (mD)
A: Cross Section Area (ft)
q: Flow Rate (STB/day)
p: Pressure (psi)

Output(s)

p D : Dimensionless Pressure (dimensionless)

Formula(s)

k A 0:5
p ¼ p pð Þ
D i
141:2 q B m
Reference: Lee, J., Rollins, J. B., & Spivey, J. P. (2003). Pressure Transient Testing (Vol. 9). Richardson, Texas: Society of
Petroleum Engineers, Page: 9.

3.20 Dimensionless pressure (linear flow/constant rate production/hydraulically-
fractured wells)

Input(s)
p i : Initial Reservoir Pressure (psi)
B: Formation Volume Factor (RB/STB)
m: Oil Viscosity (cP)
k: Permeability (mD)
h: Reservoir Thickness (ft)
q: Flow Rate (STB/day)
p: Pressure (psi)

Output(s)
p d : Dimensionless Pressure (dimensionless)

Formula(s)

k h
p ¼ p pð Þ
d i
141:2 q B m

Reference: Lee, J., Rollins, J. B., & Spivey, J. P. (2003). Pressure Transient Testing (Vol. 9). Richardson, Texas: Society of
Petroleum Engineers, Page: 10.

3.21 Dimensionless pressure (radial-flow/constant pressure production)

Input(s)
P i : Initial Reservoir Pressure (psi)
P: Final Reservoir Pressure (psi)
P wf : Well Flowing Pressure (psi)