Page 57 - Formulas and Calculations for Petroleum Engineering

50 Formulas and calculations for petroleum engineering

1.113 Pseudo-steady state productivity of horizontal wells—Method 3

Input(s)
m o : Viscosity of Oil (cP)
s x : Skin Factor (dimensionless)
h: Thickness of Reservoir (ft)
k v : Vertical Permeability (mD)
k h : Horizontal Permeability (mD)
F: Dimensionless Function (ft)
L: Length of Fracture (ft)

Output(s)

J h : Pseudo-steady State Productivity of Horizontal Wells (bbl/day psi)

Formula(s)

h

70:6 m o
J ¼ k
h h 0:5
h k h
F + s x
0:5 L k
v
Reference: Joshi, S. D. 1991, Horizontal Well Technology. Tulsa, Oklahoma: PennWell Publishing Company. Chapter: 7,
Page: 224.

1.114 Pseudo-steady state radial flow equation

Input(s)

k: Permeability (mD)
h: Thickness of Reservoir (ft)
P i : Average Reservoir Pressure (psi)
P wf : Well Flowing Pressure (psi)
B: Formation Volume Factor (bbl/STB)
m: Viscosity (cP)
r e : Drainage Radius (ft)
r w : Wellbore Radius (ft)

Output(s)
Q: Flow Rate (STB/day)

Formula(s)

0:00708 k h P P wf
i
Q ¼
r e
B m ln 0:75
r
w
Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1,
Page: 33.