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Table 3-26. Statistics of data set used to evaluate oil viscosity correlation equations at reservoir
pressures greater than bubblepoint pressure (1,981 lines of data from 186 reservoir fluid studies
with worldwide origins)
Laboratory measurement
Minimum
Median
Mean
Maximum
Bubblepoint pressure, p b , psia
120.7
1,689.7
1,821.4
5,311.7
Reservoir pressure, p , psia
120.7
2,714.7
2,749.1
7,514.7
Reservoir temperature, T R , ºF
107.0
193.0
197.5
320.0
Stock-tank oil gravity, API , ºAPI
15.8
35.0
34.4
57.7
Separator gas specific gravity, γ gSP
0.6506
0.8579
0.8949
1.9161
Solution gas-oil ratio at p b , R sb , scf/STB
12.0
384.0
461.2
1,534.0
Reservoir oil density, ρ oR , lb/cu ft
34.27
46.49
46.95
58.30
Reservoir oil viscosity, μ oR , cp
0.17
0.84
10.18
279.83
An evaluation of published reservoir oil viscosity correlation
equations is given in table 3-27.
Table 3-27. Evaluation of published oil viscosity correlation equations for reservoir pressures
greater than bubblepoint pressure
Predicted undersaturated oil viscosity
ARE, % AARE, %
Petrosky-Farshad (1995)* -18.40 32.89
Bergman-Sutton (2006) a -18.58 32.99
Dindoruk-Christman (2004) b * -17.20 34.69
Vazquez-Beggs (1980) -13.61 35.09
De Ghetto et al. (1994) c -11.52 35.87
Hanafy et al. (SPE 37439, 1997)* -6.27 36.34
Almehaideb (1997) d * 10.32 36.75
Elsharkawy-Alikhan (1999) e * 3.96 37.86
Elsharkawy-Gharbi (2001) f -11.80 40.09
Kartoatmodjo-Schmidt (1994) -21.60 41.82
Khan et al. (1987) g * 0.77 44.49
Abdul-Majeed et al. (1990) h 1.34 45.89
Standing (1977)* -17.15 55.09
Al-Khafaji et al. (1987) i 46.21 76.95
Labedi (1992) j 53.79 87.81
a Bergman, D.F. and Sutton, R.P. “Undersaturated Oil Viscosity Correlation for Adverse Conditions.” Paper SPE 103144. Presented at
the SPE Annual Technical Conference and Exhibition, San Antonio (2006). b Dindoruk, B. and Christman, P.G. “PVT Properties and
Viscosity Correlations for Gulf of Mexico Oils.” Society of Petroleum Engineers Reservoir Evaluation and Engineering . Vol. 7, No. 6 (2004)
427-437. c De Ghetto, G., Paone, F., and Villa, M. “Reliability Analysis on PVT Correlations.” Paper SPE 28904. Presented at the European
Petroleum Conference, London (1994). d Almehaideb, R.A. “Improved PVT Correlations for UAE Crude Oils.” Paper SPE 37691. Presented
at the SPE Middle East Oil Conference and Exhibition, Bahrain (1997). e Elsharkawy, A.M. and Alikhan, A.A. “Models for Predicting
the Viscosity of Middle East Crude Oil. Fuel . Vol. 78 (1999) 891-903. f Elsharkawy, A.M. and Gharbi, R.B.C. “Comparing Classical and
Neural Regression Techniques in Modeling Crude Oil Viscosity.” Advances in Engineering Software and Workstations . Vol. 32 (2001)
215-224. g Khan, S.A., Al-Marhoun, M.A., Duffuaa, S.O., and Abu-Khamsin, S.A. “Viscosity for Saudi-Arabian Crude Oils.” Paper SPE 15720.
Presented at the Fifth Middle East Oil Show, Manama, Bahrain (1987). h Abdul-Majeed, G., Kattan, R.R., and Salman, N.H. “New Correlation
for Estimating the Viscosity of Undersaturated Crude Oils.” Journal of Canadian Petroleum Technology . Vol. 29 (1990) 80-85. i Al-Khafaji,
A.H., Abdul-Majeed, G.H., and Hassoon, S.F. “Viscosity Correlation for Dead, Live and Undersaturated Crude Oil.” Journal of Petroleum
Research . Vol. 6, No. 2 (1987) 1-6. j Labedi, R. “Improved Correlations for Predicting the Viscosity of Light Crudes.” Journal of Petroleum
Science and Engineering . Vol. 8 (1992) 221-234.
Correlation
* Author restricted correlation to a specific geographical area.
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