PNGE 332
Spring 2019
HOMEWORK #5
Due 3/29/2019
1. You have a laboratory analysis of a reservoir sample from an oil well producing 41.5°API
stock-tank oil at 941 scf/STB. The sample was obtained from the reservoir at 184°F and
3463 psig. The results are given below.
(You should use EXCEL and show your work completely for full credit)
Pressure
(psig)
4800
4300
3800
3300
3200
3100
3000
2900
2854
2500
2200
1900
1600
1300
1000
700
400
100
Oil formation volume
gas-oil factor
Bo
res bbl/STB
1.648
1.657
1.667
1.677
1.68
1.682
1.684
1.687
1.688
1.634
1.591
1.551
1.511
1.473
1.437
1.402
1.365
1.318
Solution gas-oil
ratio
Rs
scf/STB
956
956
956
956
956
956
956
956
956
834
747
661
577
496
415
336
255
152
Gas formation
volume factor
Bg
bbl/set
0.000866
0.000974
0.00109
0.001252
0.001475
0.001795
0.002285
0.003108
0.00476
0.009683
Plot oil formation volume factor and solution gas/oil ratio against pressure. Guess the
bubble point pressure. Compare the shapes of your plots with Figures 8-1 and 8-2.
Compare the shapes of the B0 graph and the Rs graph.
2. Determine the value of total formation volume factor of the black oil of Problem 1 at 2500
psig.
3. Determine the value of total formation volume factor of the black oil of Problem 1 at 3300
psig.
4. Determine the value of the coefficient of isothermal compressibility of the black oil of
Problem 1 at 2500 psig.
5. An oil field with several wells has the following production history. Producing gas-oil ratio
is really separator gas-oil ratio; stock-tank gas is vented and not metered. Separator
conditions are 30 psig and 120°F. Separator gas specific gravity is 0.888, and stock-tank
oil gravity is 36.1 °APL Estimate solution gas-oil ratio at the bubble point. Compare your
answer with laboratory results of 318 scf/STB.
(You should use EXCEL and show your work completely for full credit)
Cumulative oil
production, MSTB
Producing gas-oil
ratio, scf/STB
260
455
761
1,024
1,319
1,699
1,910
2,201
2,400
2,607
2,800
2,959
3,111
3,231
3,360
3,480
3,591
3,676
3,799
3,890
3,992
4,039
4,110
4,205
4,275
4,317
4,390
4,435
4,500
4,540
4,600
310
322
286
305
317
402
434
515
575
610
661
602
723
769
848
911
974
990
1,092
1,044
1,143
1,170
1,318
1,271
1,407
1,485
1,494
1,373
1,467
1,305
1,446
6. The pressure-production history for an oil field is given below. Estimate bubble-point
pressure. Compare your answer with laboratory results of 1441 psig.
(You should use EXCEL and show your work completely for full credit)
Reservoir pressure
psi
3,122
2,982
1,830
1,275
965
1,095
933
495
Cumulative oil
production
MSTB
110
370
1,050
1,400
3,060
3,160
3,360
4,620
7. Calculate formation volume factor of oil for Good Oil Co. No. 4 at 4500 psig. Use optimum
separator conditions.
8. Calculate solution gas-oil ratio for Good Oil Co. No. 4 at 4500 psig. Use optimum
separator" conditions.
9.
Calculate total formation volume factor for Good Oil Co. No. 4 at 4500 psig. Use
optimum separator conditions.
10. Determine the viscosity of the oil in the reservoir of Good Oil Co. No. 4 at 4500 psig and
220°F.
11. Calculate a value of coefficient of isothermal compressibility for use at pressures between
4500 psig and 4000 psig at 220°F for Good Oil Co. No. 4.
...

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