## Transcribed Text

HOMEWORK 5
1. The following information is available from a gas reservoir:
P. 2000 psia 78 0.69 T -100°F ==18ft.
3=8.7%
S
25%
k
87.5
md
0 D=7.76x10"3 MCFD A 3920 acres Nwells Current Presure = 1660 psia
A. Determine the initial gas in place and the cumulative gas production.
B. Determine how long this reservoir can sustain a rate of 10 MMCD against well
pressure of 400 psia.
C. Repeat part B, assuming that the rate is 12 MMCFD.
D. Repeat part B, assuming that the well pressure is 200 psia.
E. Repeat part C, assuming that that the well pressure is 200 psia.
Number range CHAPTER
2. The following information is available from a wet gas reservoir:
T = 100°F P 2527 psia A 1780 acres
h
13ft.
ç0
8.5%
Swr
=
26%
Separator Gas Rate 4325 MCF/D Separator Gas Gravity 0.63
Stock-Tank Gas Rate 650 MCF/D Stock-Tank Gas Gravity 1.00
Stock-Tank Oil Rate 35 STB/D
Stock-Tank Oil Gravity = 47° API
The reservoir is completely surrounded by an aquifer with the following properties:
k 100 md
h 15ft.
4 10%
Hw=1cp
g=7x10°1/psi
Calculate the reservoir pressure after producing at a constant separator gas rate of
4325 MCF/D for one year. You can ignore the water production.
3. PVT, relative permeability, and other data for a solution gas drive oil reservoir are
were provided below. Determine:
A) The cumulative oil and gas production when the reservoir pressure reaches 300
psia.
B) The time it takes to reach the reservoir pressure of 500 psia. There are 10 wells in
the reservoir.
P. 1700 psia h 13.4ft. 15.7%
Sm = 25%
k 30 md s=0
A 3640 acres
Allowable Flow Rate = 300 STB/D (per well)
Max. Safe Drawdown 400 psi
Min. Flowing Pressure = 100 psi (with a pump)
P
Bo
Rs
Wo
Ka
psia
RB/STB
RB/STB
SCF/STB
cp
cp
1700
1.265
1.32
540
1.19
0.0200
1500
1.241
1.50
490
1.22
0.0203
1300
1.214
1.75
440
1.25
0.0205
1100
1.191
2.10
387
1.30
0.0207
900
1.161
2.62
334
1.35
0.0209
700
1.147
3.44
278
1.50
0.0214
500
1.117
4.95
220
1.80
0.0245
300
1.093
8.60
160
2.28
0.0265
S2
krg
kro
1.00
0.000
1.00
0.95
0.0053
0.840
0.90
0.0138
0.701
0.85
0.0356
0.586
0.80
0.0920
0.491
0.75
0.2390
0.411
0.68
0.9040
0.320
0.60
4.1370
0.241
Allowable Flow Rate - 300 STB/D (per well)
Mox. Safe Drawdown= 400 psi
Min. Flowing Pressure = 100 psit (with a pump)

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