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Petroleum Reservoir Engineering Practice by Nnaemeka Ezekwe

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Chapter 6. PVT Properties Predictions from Equations of State

6.1 Historical Introduction to Equations of State (EOS)

The most common and familiar equation of state (EOS) is the ideal gas EOS. This was derived in Chapter 4 from the combination of Boyle’s and Charles’ Laws on gases. The ideal gas EOS was represented in Eq. (4.7) as pV = nRT. The EOS for real gases was represented in Eq. (4.9) as pV = znRT. As discussed in Chapter 4, the gas compressibility factor, z, is used to account for the non-ideality of real gases. The gas compressibility factor is not constant but varies with the temperature and pressure of the system. This imposes mathematical limitations on the direct application of real gas EOS for representation of thermodynamic state ...

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