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correlations. The Rogers-Pitzer and Archer equations of state perform
well at pressures below 14,500 psia (100 MPa) but exhibit increasingly
large errors as pressure approaches 29,000 psia (200 MPa). The AARE
for the modified Spivey et al. correlation (0.052%) is more than an
order of magnitude lower than that for the Rogers-Pitzer (0.58%) and
Archer (0.57%) equations of state for pressures approaching 29,000 psia
(200 MPa).
Figure 4-6 shows the AARE in density as a function of sodium
chloride content for data in the brine density database in table 4-1. The
Rogers-Pitzer and Archer equations of state have slightly lower values of
AARE for salinities less than 0.5 wt%. Otherwise, the modified Spivey et
al. correlation performs as well as or better than all the other correlations
throughout the range of salinities in the database.
100.000%
10.000%
1.000%
0.100%
0.010%
0.001%
0%
5%
10%
15%
20%
25%
30%
Salinity, weight % NaCl
Spivey et al. (modified)
Rowe-Chou (1970)
Rogers-Pitzer (1982)
Kemp et al. (1989)
McCain (1990)
Archer (1992)
Fig. 4-6. Average absolute relative error in density as a function of salinity for various correlations,
based on the brine density database in table 4-1
 
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