Page 158 - PVT Property Correlations

132 PVT Property Correlations

TABLE 6.5 Solution Gas Oil Ratio Corrected to Different Separator
Conditions
R s , scf/STB
Pressure, Laboratory Separator Separator Separator
psia Test 1 Test 2 Test 3
9991 3612 2968 2833 2754
9498 3612 2968 2833 2754
9005 3612 2968 2833 2754
8497 3612 2968 2833 2754
8004 3612 2968 2833 2754
7497 3612 2968 2833 2754
7004 3612 2968 2833 2754
6496 3612 2968 2833 2754
6003 3612 2968 2833 2754
5496 3612 2968 2833 2754
5003 3612 2968 2833 2754
4495 3612 2968 2833 2754
4118 3612 2968 2833 2754
3915 3059 2497 2375 2302
3625 2534 2049 1940 1873
3045 1783 1410 1318 1259
2320 1213 924 846 793
1595 801 572 505 456
943 514 327 266 221
290 220 77 23 0

Fig. 6.11 shows Lasater (1958) calculated using the solution GOR from
flash, and the three separator tests. The comparison plot shows that different
separator conditions can affect the solution GOR. This implies that we need
to use the proper total solution GOR when calculating PVT properties for
engineering applications.
The plot also shows the importance of predicting bubble point pressure as
accurately as possible. The large difference observed between Glaso (1980)