PVT reports often lists separator corrected Gas/Oil Ratios (GORs), Gas and Oil Formation Volume Factors (FVFs), etc. together with measured Differential Liberation (DL) and Constant Volume Depletion (CVD) data. The separator corrected black oil properties listed in PVT reports are calculated using empirical correlations. But, what does separator corrected black oil properties stand for and …
With PVTsim Nova 2.0 Calsep is introducing the CPA equation of state as one of the EoS alternatives. The CPA equation of state was presented by Kontogeorgis et al. (1996). CPA stands for Cubic Plus Association, which refers to a classic cubic equation of state with an association term. More specifically CPA combines the SRK …
Calsep recently got access to data for the compositional variation with depth in five North Sea reservoirs. All five reservoirs have a gas-oil contact in the interval fluid samples were taken. Figure 1 shows the variation in saturation pressure with depth in two of the reservoirs. The depths are relative to the depth of the …
It was a major achievement when Peneloux et al in 1982 presented the method for volume correcting a cubic equation of state. It enabled liquid densities to be matched using a cubic equation, which was not possible with the equations in their original form. Prior to that time cubic equations had mainly been used to …
#2: How good are the predictions of sound velocity with an equation of state? Read More »
Cubic equations have been an industrial standard in oil industry since the nineteen eighties, but in the original form those equations are unable to handle the mutual solubility between hydrocarbons and aqueous components. Formation water is often produced together with petroleum reservoir fluids and hydrate inhibitors may have to be added to prevent hydrate formation …
#1: Huron-Vidal Mixing Rule. A Unique Combination of a Cubic Equation and a GE model Read More »
