PROPERTIES OF OILFIELD BRINES - Petroleum Reservoir Fluid Property Correlations - page 156

Table 4-5. Results of evaluation of methane solubility correlations against methane solubility
database in table 4
Correlation

ARE AARE

Spivey et al. (modified) -0.08% 5.90%

Duan-Mao (2006) -1.32% 6.41%

Duan et al. (1992) -5.86% 8.89%

Spivey et al. (2004) -8.01% 10.42%

McGee et al. (1981) -23.93% 26.86%

McCain (1990) -15.64% 32.97%

Figure 4-16 shows the ARE and AARE in methane solubility in
sodium chloride brine as functions of temperature. At temperatures
below 100ºF (37.8ºC), the Duan et al. (1992) correlation gives the lowest
AARE, with the Duan-Mao (2006) and modified Spivey et al. correlations
both giving an AARE slightly higher than 2%. For temperatures from
100ºF to 450ºF (37.8ºC to 232.2ºC), the Duan-Mao (2006) correlation
and the modified Spivey et al. correlation give very similar results.
Between 450ºF and 572ºF (232.2ºC and 300ºC), the modified Spivey et
al. correlation gives an AARE lower than any of the other correlations.
The Duan et al. (1992) and Spivey et al. (2004) correlations perform
significantly worse than either the Duan-Mao (2006) correlation or the
modified Spivey et al. correlation.
Figure 4-17 shows the ARE and AARE in methane solubility in
sodium chloride brine as functions of pressure. The modified Spivey et
al. correlation has a consistent AARE of 5% to 7% throughout the range
of pressures in the database. At pressures below 2,900 psia (20 MPa), the
Duan et al. (1992) and Duan-Mao (2006) correlations perform slightly
better than the modified Spivey et al. correlation. The modified Spivey
et al. correlation performs slightly better than the Duan-Mao (2006)
correlation for pressures from 14,500 to 29,000 psia (100 to 200 MPa).
Figure 4-18 shows the ARE and AARE in methane solubility as
functions of salinity. The modified Spivey et al. correlation has a
consistent AARE of 5% to 7% throughout the range of salinities in the
database. For salinities below 12.5 wt% sodium chloride, the Duan-Mao
(2006) correlation and the modified Spivey et al. correlation give very
similar results. For salinities above 12.5 wt% sodium chloride, the
modified Spivey et al. correlation gives slightly lower AARE than does
the Duan-Mao correlation. The Duan et al. (1992) and Spivey et al.
(2004) correlations give an AARE that increases with increasing salinity.