Page 76 - Formulas and Calculations for Petroleum Engineering

Reservoir engineering formulas and calculations Chapter 1 69

Output(s)

B w : Water Formation Volume Factor (McCain Correlation) (bbl/STB)

Formula(s)

2 4 7 2
B ¼ 1 1:00010 10 +1:33391 10 T +5:50654 10 T
w
9 13 2 7 10 2
1 1:95301 10 p T 1:72834 10 p T 3:58922 10 p 2:25341 10 p
Reference: Applied Petroleum Reservoir Engineering, Second Edition, Craft & Hawkins, Page: 45.

1.159 Water influx—Pot aquifer model

Input(s)
c t : Aquifer Total Compressibility (1/psi)
W i : Initial Volume of Water in Aquifer (bbl)
P i : Initial Reservoir Pressure (psi)
P: Current Reservoir Pressure (Pressure at Oil-Water Contact) (psi)

Output(s)

W e : Cumulative Water Influx (bbl)

Formula(s)

ð
W ¼ c W P PÞ
e
i
i
t
Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 2,
Page: 152.
1.160 Water influx constant for the van Everdingen and Hurst unsteady-state model

Input(s)
c t : Total Aquifer Compressibility (1/psi)
Ø: Porosity of the Aquifer (fraction)
r e : Radius of Reservoir (ft)
h: Thickness of the Aquifer (ft)
f: Encroachment Angle (Divided by 360)

Output(s)
B: Water Influx (bbl)

Formula(s)

2

B ¼ 1:119 Ø c r h f
t e
Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 4,
Page: 310.