Page 37 - Formulas and Calculations for Petroleum Engineering

30 Formulas and calculations for petroleum engineering

Formula(s)

2 2
h h l Þ
ð
q ¼ 1:535 10 3 k v
o
o r r g h
r
B m ln e
o o
r
w
Reference: Horizontal Well Technology, Joshi, Page: 286–295.
1.65 Hydrocarbon pore volume occupied by evolved solution gas
Input(s)
N: Initial Oil in Place (STB)
N p : Cumulative Oil Production (STB)
R si : Gas Solubility at Initial Reservoir Pressure (SCF/STB)
R s : Current Gas Solubility (SCF/STB)
B g : Current Gas Formation Volume Factor (bbl/SCF)
R p : Net Cumulative Produced Gas-Oil Ratio (SCF/STB)

Output(s)

V: Volume of the Evolved Gas that Remains in the PV (PV)

Formula(s)

V ¼ N R N R N N R B
si p p p s g

Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 4,
Page: 301.

1.66 Hydrocarbon pore volume occupied by gas cap
Input(s)

m: Ratio of Initial Gas Cap Gas Reservoir Volume to Initial Reservoir Volume (bbl/bbl)
N: Initial Oil in Place (STB)
B oi : Initial Oil Formation Volume Factor (bbl/STB)
B gi : Initial Gas Formation Volume Factor (bbl/SCF)
B g : Current Gas Formation Volume Factor (bbl/SCF)

Output(s)

V: Volume of the Gas Cap at Current Pressure (bbl)

Formula(s)

m N B B g
oi
V ¼
B
gi
Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 4,
Page: 301.