Page 15 - Formulas and Calculations for Petroleum Engineering

8 Formulas and calculations for petroleum engineering

Formula(s)
0:111924 k A
C ¼
T L

Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3,
Page: 235.

1.14 Compressibility drive in gas reservoirs

Input(s)
G: Gas in place (MSCF)
G P : Gas Produced (MSCF)
3
B g : Gas Formation Volume Factor (MSCF/ft )
3
E f : Gas Compressibility Drive (ft /MSCF)
Output(s)
CI: Compressibility Index (dimensionless)

Formula(s)
G E
f
CI ¼
B G
g P
Reference: Ahmed, T. & McKinney, P. D. Advanced Reservoir Engineering, Gulf Publishing House, Burlington, MA, 2015.

1.15 Correction factor—Hammerlindl

Input(s)

G: Gas in Place (MSCF)
G p : Gas Produced (MSCF)
B g : Gas Formation Volume Factor (bbl/MSCF)
E f, w : Rock and Water Expansion Term (bbl/MSCF)

Output(s)
CDI: Compressibility Drive Index (dimensionless)

Formula(s)
G E
f,w
CDI ¼
G B
p g
Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3,
Page: 211.

1.16 Critical rate for horizontal Wells in edge-water drive reservoirs
Input(s)

e1: Constant for C1 Equals +0.023 or 0.023 (dimensionless)
e2: Constant for C2 equals +0.0013 or 0.0013 (dimensionless)
e3: Constant for C3 equals +0.022 or 0.022 (dimensionless)
e4: Constant for C4 equals +0.0013 or 0.0013 (dimensionless)
D r : Density Difference between water and oil or, oil and gas (gm/cc)