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Table 3-19. Evaluation of published oil formation volume factor correlation equations for reservoir
pressures equal to bubblepoint pressures reveals the most reliable correlations.
Predicted oil formation volume factors
ARE, % AARE, %
Equation (3.21a), p b from data, ρ oRb from equations (3.18a)-(3.18h) -0.24 1.49
Al-Marhoun (1992)* 0.47 1.53
Equation (3.21a), p b from equation (3.7), ρ oRb from equations (3.18a)-(3.18h) -0.34 1.57
Al-Shammasi (1999) a * 0.16 1.60
Kartoatmodjo-Schmidt (1994) 0.17 1.67
Al-Marhoun (1988) b * -0.14 1.82
Standing (1977) -0.05 1.84
Sutton (2008)*, p b from equation (3.7) -0.05 1.90
Ahmed (1989), p b from equation (3.7) 0.60 2.03
Omar-Todd (1993) c * 0.22 2.44
Glaso (1980)* -1.31 2.51
Casey-Cronquist (1992) , p b from data 1.52 2.55
Levitan-Murtha (1999) d 0.94 2.56
Almehaideb (1997) e† 0.45 3.33
Khairy et al. (1998) f * †‡ 1.94 4.17
Vazquez-Beggs (1980), p b from data -1.39 4.36
Macary-El-Batanony (1993) g * 9.02 9.04
Hanafy et al. (SPE 37439, 1997) 9.47 9.52
Carlson (1997), p b from data -8.47 9.98
Elsharkawy-Alikhan (1977) h*† 37.43 37.43
a Al-Shammasi, A.A. “Bubble Point Pressure and Oil Formation Volume Factor Correlations.” Paper SPE 53185. Presented at the SPE Middle
East Oil Show, Bahrain (1999). b Al-Marhoun, M.A. “PVT Correlations for Middle East Crude Oils.” Journal of Petroleum Technology . Vol. 40
(May 1988) 650-666. c Omar, M.I. and Todd, A.C. “Development of New Modified Black Oil Correlations for Malaysian Crudes.” Paper
SPE 25338. Presented at the SPE Asia Pacific Oil and Gas Conference, Singapore (1993). d Levitan, L.L. and Murtha, M. “New Correlations
Estimate Pb, FVF.” Oil & Gas Journal . Vol. 97 (March 8, 1999) 70-76. e 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). f Khairy, M., El-Tayeb, S., and
Hamdallah, M. “PVT Correlations Developed for Egyptian Crudes.” Oil & Gas Journal . Vol. 98, No. 18 (May 4, 1998) 114-116. g Macary,
S.M. and El-Batanony, M.H. “Derivation of PVT Correlations for Gulf of Suez Crude Oils.” Sekiyu Gakkaishi . Japan. Vol. 36, No. 6 (1993).
h Elsharkawy, A.M. and Alikhan, A.A. “Correlations for Predicting Solution Gas/Oil Ratio, Oil Formation Volume Factor, and Undersaturated
Oil Compressibility.” Journal of Petroleum Science and Engineering . Vol. 17 (1997) 291-302. * Author restricted correlation to B ob only.
Author restricted the correlation to a specific geographical area.
Correlation
Modified second term in authors' equation 2 to 0.000705341.
Oil formation volume factors at reservoir pressures less than
bubblepoint pressure
Equation (3.21a) was derived for use in calculating oil formation
volume factors when the reservoir pressure is equal to the bubblepoint
pressure of the reservoir oil. The question is whether this equation
can be used at pressures less than bubblepoint pressure with reservoir
oil densities, solution gas-oil ratios, and oil formation volume factors
at pressures below bubblepoint pressure substituted for the values at
bubblepoint pressure.
The values of stock-tank oil density and weighted average surface
gas specific gravity determined for use at bubblepoint pressure may be
assumed constant for the lower pressures.
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