PROPERTIES OF BLACK OILS - Petroleum Reservoir Fluid Property Correlations - page 106

Table 3-25. Evaluation of published reservoir oil viscosity correlation equations for reservoir
pressures equal to and less than bubblepoint pressures reveals the most reliable correlations.
Correlation Predicted saturated oil viscosity
ARE, % AARE, %
Beggs-Robinson (1975) -5.63 27.60
Dindoruk-Christman (2004) a * -9.18 29.90
Ng-Egbogah (1983) b with Beggs-Robinson (1975) 2.86 30.50
Petrosky-Farshad (1995)* 2.47 31.15
Elsharkawy-Gharbi (2001) c -7.43 31.63
Almehaideb (1997) d * 7.39 34.36
Hanafy et al. (SPE 37439, 1997)* 10.06 34.78
Kartoatmodjo-Schmidt (1994) -7.62 35.69
Al-Khafaji et al. (1987) e -7.63 35.70
Bergman (1992) f 13.46 36.44
Abu-Khamsin-Al-Marhoun (1991) g * 18.99 40.04
Elsharkawy-Alikhan (1999) h * 21.46 40.45
Bergman-Sutton (2007) i 21.12 40.81
Standing (1977)* -8.13 41.60
Aziz et al. (1972) j -41.10 44.06
Khan et al. (1987) k * 15.41 45.04
Naseri et al. (2005) l * -67.28 68.55
Labedi (1992) m 58.37 83.65
a 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. b Ng, J.T.H. and Egbogah, E.O. “An Improved Temperature-Viscosity
Correlation for Crude Oil Systems.” Paper 83-34-43. Presented at Petroleum Society of CIM 34th Annual Technical Meeting, Banff (1983).

c 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. d Almehaideb, R.A. “Improved PVT Correlations for UAE Crude Oils.”
Paper SPE 37691. Presented at the Middle East Conference and Exhibition, Bahrain (1997). e Al-Khafaji, A.H., Abdul-Majeed, G.H., and
Hassoon, S.F. “Viscosity Correlation for Dead, Live and Undersaturated Crude Oils.” Journal of Petroleum and Gas Exploration Research .
Vol. 6, No. 2 (1987) 1-6. f Whitson, C.H. and Brule, M.R. Phase Behavior . Richardson, TX: Society of Petroleum Engineers (2000) 35-37.
g Abu-Khamsin, S.A. and Al-Marhoun, M.A. “Development of a New Correlation for Bubblepoint Oil Viscosity.” Arabian Journal for Science &
Engineering . Vol. 16, No. 2A (1991) 99-106. h Elsharkawy, A.M. and Alikhan, A.A. “Models for Predicting the Viscosity of Middle East Crude
Oil.” Fuel . Vol. 78 (1999) 891-903. i Bergman, D.F. and Sutton, R.P. “An Update to Viscosity Correlations for Gas-Saturated Crude Oils.”
Paper SPE 110195. Presented at the SPE Annual Technical Conference and Exhibition, Anaheim (2007); and Whitson, C.H. and Brule, M.R.,
2000. j Aziz, K., Govier, G.W., and Forarasi, M. “Pressure Drop in Wells Producing Oil and Gas.” Journal of Canadian Petroleum Technology .
Vol. 11 (1972) 38-42. k 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). l Naseri, A., Nikazar, M., and Mousavi Dehghani,
S.A. “A Correlation Approach for Prediction of Crude Oil Viscosities.” Journal of Petroleum Science and Engineering . (2005) 163-174.
m Labedi, R. “Improved Correlations for Predicting the Viscosity of Light Crudes.” Journal of Petroleum Science and Engineering .
Vol. 8 (1992) 221-234. * Author restricted the correlation to a specific geographical area.

The data of table 3-24 were sorted and split into eight segments each
with approximately 140 lines of data. These were done for stock-tank
oil gravities, solution gas-oil ratios, reservoir temperatures, reservoir
oil pressures, reservoir oil densities, and measured values of reservoir
oil viscosities. The five best correlation equations listed in tables 3-23
and 3-25 were selected for evaluation. Values of ARE and AARE were
determined for each of these segments. The results are given in figures
3-33 through 3-38.