Page 33 - Principles of Applied Reservoir Simulation 2E

18 Principles of Applied Reservoir Simulation

Exercise 2.4 Derive Eq. (2.15) for the exponential decline case by using Eq.
(2.11) as the integrand and performing the integration.

Nomenclature
for Equation (2.3)

gas formation volume factor (FVF) [RB/SCF]
gas cap FVF [RB/SCF]
injected gas FVF [RB/SCF]
oil FVF [RB/STB]
B B 0 + (R si- R so)B g = composite oil FVF [RB/STB]
- R sw)B g = composite water FVF [RB/STB]
B w + (R swi
c f formation (rock) compressibility [1/psia]
G initial gas in place [SCF]
G, cumulative gas injected [SCF]
cumulative gas cap gas produced [SCF]
cumulative solution gas produced as evolved gas [SCF]
m ratio of gas reservoir volume to oil reservoir volume
N initial oil in place [STB]
cumulative oil produced [STB]
solution gas-oil ratio [SCF/STB]
R initial solution gas-oil ratio [SCF/STB]
solution gas-water ratio [SCF/STB]
yw
R, initial solution gas-water ratio [SCF/STB]
gas saturation [frac.]
oil saturation [frac.]
water saturation [frac.]
initial water saturation [frac.]
initial water saturation in gas cap [frac.]
'wig
initial water saturation in oil zone [frac.]
s. WIO
w cumulative water influx [STB]
cumulative water injected [STB]
w cumulative water produced [STB]
AP P,'P = reservoir pressure change [psia]
initial reservoir pressure [psia]
reservoir pressure corresponding to cumulative fluid times [psia]