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PVT ANALYSIS
FIVE RESERVOIR FLUIDS 1.
Black oil:
GOR of 2000 scf/STB or less.
stock tank oil gravity is usually below 45º API.
stock tank oil is dark indicating of presence heavy hydrocarbons.
Color is often black or brown .
PHASE DIAGRAM OF BLACK OIL:
EXERCISE 1:
The reported production from the discovery well of the Nancy Field is given below. How would you classify this reservoir fluid?
PRODUCTION D ATA Date(month)
API
Oil ,STB
Gas , Mscf
1
29
4276
1165
2
28
16108
5270
3
28
15232
4800
4
28
15585
4960
5
28
15226
4650
6
28
14147
2335
7
28
15720
4707
8
28
15885
4904
9
28
15434
4979
10
28
12862
4339
11
28
14879
4814
12
28
15192
4270
PRODUCTION DATA Date(month)
API
Oil ,STB
Gas , Mscf
GOR
1
29
4276
1165
272
2
28
16108
5270
327
3
28
15232
4800
315
4
28
15585
4960
318
5
28
15226
4650
305
6
28
14147
2335
165
7
28
15720
4707
300
8
28
15885
4904
308
9
28
15434
4979
322
10
28
12862
4339
337
11
28
14879
4814
323
12
28
15192
4270
281
FIVE RESERVOIR FLUIDS
Volatile oil: Initial gas-oil ratios between 2000-3300 scf/STB. Stock-tank oil gravity is usually 40 ºAPI or more. Stock tank color is brown ,orange or green. Oil formation volume factor is usually greater than 2.0 res bbl/STB.
Retrograde Gas:
Initial gas-oil ratio is more than 3300scf/STB up. Practically gas-oil ratios more than 50000 scf/STB are usually treated as wet gases. Stock-tank oil gravity is between 40 ºAPI and 60 ºAPI. Liquid can be lightly colored, brown, orange greenish or waterwhite.
PHASE DIAGRAM OF GAS CONDENSATE:
PHASE DIAGRAM OF VOLATILE
OIL:
FIVE RESERVOIR FLUIDS
Wet gas: A wet gas exists solely as a gas in the reservoir throughout the reduction in reservoir pressure. Produced stock tank liquid gravity is the same as retrograde gas however it doesn’t change during the life of the reservoir.
Dry Gas: is simply methane with some intermediates. No liquid is formed at the surface.
PHASE DIAGRAM OF WET GAS:
PHASE DIAGRAM OF DRY GAS:
EXERCISE 2:
The annual production statistics for west Oakvale field are given. Classify the reservoir fluid. Date
API
Oil STB
Water STB
Gas Mscf
1982
46
4646
1484
463,265
1983
50
2608
1177
342075
1984
47
1350
1215
241048
1985
48
1430
932
221,020
1986
50
1662
1122
267,106
1987
51
1110
665
178,951
ANNUAL PRODUCTION Date
API
Oil STB
Water STB
Gas Mscf
GOR
1982
46
4646
1484
463,265
99712
1983
50
2608
1177
342075
131163
1984
47
1350
1215
241048
182612
1985
48
1430
932
221,020
154559
1986
50
1662
1122
267,106
160713
1987
51
1110
665
178,951
161217
PHASE DIAGRAMS:
EXERCISE 3:
Laboratory analysis of a reservoir sample is given. The sample was obtained from the reservoir at 184 F and 3463 psig.
Plot the formation volume factor and solution gas oil ratio.
OIL FORMATION VOLUME FACTOR:
SOLUTION GAS OIL RATIO:
COEFFICIENT OF ISOTHERMAL COMPRESSIBILITY
The coefficient of isothermal compressibility is defined as the fractional change of volume as pressure is changed at constant temperature.