Page 14 - Formulas and Calculations for Petroleum Engineering

Reservoir engineering formulas and calculations Chapter 1 7

Formula(s)

m I 2
f
F b + b r
τ ¼
k
Reference: Zoback, M. D. Reservoir Geomechanics, Cambridge University Express, UK, Page: 41.

1.11 Cole plot

Input(s)

G: GIP (MSCF)
E g : Gas Expansion Term (bbl/MSCF)
W e : Water influx (bbl)

Output(s)
F: Underground Water Withdrawal (bbl)

Formula(s)
F ¼ G E + W e
g

Reference: Ahmed, T., McKinney, P. D. Advanced Reservoir Engineering, Gulf Publishing House, Burlington, MA, 2015.

1.12 Communication between compartments in tight gas reservoirs

Input(s)
G: Gas in Place (MSCF)
E g : Gas Expansion Term (bbl/MSCF)
W e : Cumulative Water Influx (bbl)

Output(s)

F: Underground Fluid Withdrawal (bbl)

Formula(s)
F ¼ G E + W e
g

Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3,
Page: 209.

1.13 Communication factor in a compartment in tight gas reservoirs
Input(s)

K: Permeability (mD)
2
A: Area (ft )
T: Temperature (R)
L: Length of Compartment (ft)

Output(s)
2
C: Communication Factor (SCF/d/psi /cP)