Oil temperature eobd facile journey8/22/2023 ![]() Correlation Selection Based on Data Range and Ranking These correlations and their applications were discussed in Chapter 5, Gas Condensates, and Chapter 6, Volatile Oil ( El-Banbi et al., 2006 Nassar et al., 2013). Although individual PVT properties are available for some MBO PVT properties, two correlation families are available for all four MBO PVT properties. If the modified black-oil (MBO) model is needed for a certain application, fewer options are available. If the black-oil model is to be used, many correlations are available. In some applications, the required PVT model determines the correlations to use. Correlation Selection Based on Required PVT Model (Application) Use of these correlations outside their range of applicability usually leads to errors that may be easily avoided. (1995) were developed for heavy and extraheavy crude oils, and therefore, use of these correlations is recommended for heavy oils. For example, the correlations of De Ghetto et al. Several correlations that pertain to specific fluid type were developed for oils or gases. Correlation Selection Based on Type of Fluid In addition, Al-Shammasi (2001), in a large comparison study, showed that geographical location-based correlations are not guaranteed to work. Therefore, caution is advisable in use of the geographical correlation approach. New correlations are required for the fluids more recently discovered in these traditional regions when sufficient data becomes available. Deeper reservoirs developed at a later stage usually contain more volatile oil and richer gas condensate fluids. The geographical PVT correlation families may have been developed from PVT data collected from relatively shallow reservoirs. ![]() Although it is logical to assume that oil in different reservoirs in a particular geographical location is of the same origin, it is erroneous to assume that this approach is consistently reliable. In absence of laboratory-measured PVT data, many engineers use specific correlation families for crude oils based on geographical origin. Appendix C, Oil Correlations Range of Applicability, gives the application ranges of each correlation and identifies the geographical origin of each correlation, where applicable. (1997) for Egyptian crudes and Omar and Todd (1993) for Malaysian crudes. Among the commonly known geographical correlations are Al-Marhoun (1988) correlations for Saudi Arabian crudes Standing (1947) for California crudes Petrosky (1990) for Gulf of Mexico crudes Hanafy et al. Many oil PVT correlations were developed with data sets that belong to a specific region. Correlation Selection Based on Geographical Location For selection of correlation(s) to use for a specific fluid, the following approaches are available: (1) use of geographical location, (2) use of the type or obvious characteristics of the fluid, (3) use of correlations based on application, (4) use of data ranges and ranking, and (5) use of an expert system or set of rules. Researchers of PVT correlations usually develop a separate correlation for each PVT property from their PVT laboratory-measured data. ![]() Oil and gas PVT correlations can usually be grouped into correlation families. The number of oil correlations available exceeds that of gas correlations ( Appendix A: Oil Correlations Formulae and Appendix B: Gas Correlations Formulae). Numerous PVT correlations exist for each oil (and gas) property. Ahmed El-Maraghi, in PVT Property Correlations, 2018 Selection of PVT Oil Properties Correlations
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