Page 186 - PVT Property Correlations

160 PVT Property Correlations

TABLE 7.12 Undersaturated Dead Oil Viscosity Correlations
Dead Oil Al-Khafaji et al. Ansrade (1930) Beal (1946)
Viscosity (1987)
Beggs and Bennison (1998) Bergman (2004) Bergman and
Robinson (1975) Sutton (2006)
De Ghetto et al. Dindrouk and Elsharkawy and Elsharkawy and
(1995) Christman (2001) Alikhan (1999) Gharbi (2001)
Fitzgerlad (1997) Glasso (1980) Hossain et al. Ikiensikimama
(2005) (2008)
Kartoatmdjo and Kartoatmdjo and Kaye (1985) Khan et al. (1987)
Schmidt (1991) Schmidt (1994)
Khazam et al. Labedi (1982) Labedi (1992) McCain (1991)
(2016)
Naseri et al. Naseri et al. Ng and Egbogah Oyedeko and
(2005) (2012) (1983) Ulaeto (2011)
Petrosky (1990) Petrosky and Petrosky and Petrosky and
Farshad (1993) Farshad (1995) Farshad (1998)
Sattarina et al. Standing (1947) Standing (1981) Ulaeto and
(2007) Oyedeko (2014)
Whitson and
Brule (2000)

Field Data for Oil PVT Correlations

Calculating PVT properties for oils requires four inputs, which can be
obtained from readily available field information. These inputs include: (1)
total solution GOR at the bubble point; (2) API gravity of stock-tank oil; (3)
specific gravity of separator gas; and (4) temperature.
Several oil PVT properties require knowledge of bubble-point pressure.
Bubble-point pressure (at the required temperature) can be estimated from
any of the bubble-point pressure correlations. If the bubble-point pressure is
known from external sources, it can be directly used in calculating other oil
PVT properties from their respective correlations. Prior knowledge of
bubble-point pressure improves the accuracy of most correlations.

Estimating Solution Gas Oil Ratio
Total solution GOR is obtained from oil and gas sales data. In theory, the
solution GOR is constant as long as the reservoir pressure is above
the bubble-point pressure; in practice, however, some wells produce below
the bubble-point pressure and therefore have higher producing GOR than
solution GOR. It is usually advisable to make a plot of producing GOR