Page 65 - Formulas and Calculations for Petroleum Engineering

58 Formulas and calculations for petroleum engineering

Output(s)

2
K: Transmissivity (mm )

Formula(s)

2
K ¼ C DðÞ

Reference: Wikipedia.org.

1.133 Trapped gas volume in water-invaded zones

Input(s)

W e : Cumulative Water Influx (bbl)
W p : Cumulative Water Produced (bbl)
B w : Water Formation Volume Factor (bbl/STB)
s wi : Initial Water Saturation (fraction)
s grw : Relative Gas Saturation (fraction)

Output(s)

TG: Trapped Gas Volume (MSCF)

Formula(s)

!
W W B
e p w
TG ¼ s grw
1 s s
wi grw
Reference: Ahmed, T., McKinney, P.D.2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3,
Page: 208.

1.134 Two-phase formation volume factor

Input(s)
Bo: Oil formation vol factor (fraction)
Bg: Gas formation vol factor (fraction)
R soi : Initial Solution oil gas ratio (fraction)
R so : Solution oil gas ratio (fraction)

Output(s)
B t : Oil formation factor (fraction)

Formula(s)

ð
ð
B ¼ Bo + Bg Rsoi RsoÞÞ
t
Reference: Petrowiki.org.