Page 207 - PVT Property Correlations

Black Oils Chapter | 7 181

(c) For the pressure range given in the table, calculate the isothermal
compressibility of oil from the following correlations.
Ahmed (1989)
Al-Marhoun (2006)
Al-Mehaidab (1997)
De Ghetto et al. (1995)
Dindoruk and Chrisman (2004)
ElSharkawy and Alikhan (1997)
Farshad et al. (1996)
Hanafy et al. (1997)
Kartoatmdjo and Schmidt (1991)
McCain (1991)
McCain et al. (1988)
Petrosky and Farshad (1998)
Spivey et al. (2007)
Standing (1947)
Vasquez and Beggs (1980)
(d) Compare the calculated undersaturated oil compressibility from
the different correlations with the following laboratory-measured com-
pressibility values.

Pressure, psig Oil Compressibility x 10E6, psi 1
3000
2750 12.909
2339 14.034
2200 15.159
2000 16.284
1800 17.184
1600 18.084
1550 18.309

7.2 An oil reservoir was discovered in 2015 and has been producing with
initial reservoir pressure of 2283 psi and GOR of 420 scf/STB (GOR is
measured based on separator data). Primary separator conditions are

150 psig and 100 F. A sample from sales gas (separator gas) was taken
to measure the gas composition and its heat content. The specific grav-
ity of separator gas is 0.92. The stock-tank gas is vented. Oil gravity
was measured for sales oil to be 49 API. The log reading of temperature

at the pay zone is 175 F. The preliminary volumetric calculations
showed OOIP of 25 MMSTB while the average reservoir permeability
is 322 md and the initial water cut is 22%. Estimate the input data
required for calculating oil PVT properties from correlations for this
reservoir fluid.