In a Hydrocarbon Reservoir, Why do we ignore "Volume Expansivity" while considering only the "Isothermal Compressibility" for a given change in fluid volume?
OR in other words,
Why does the Volumetric Strain associated with the Pressure variation gain importance, while the Volumetric strain associated with the Temperature variation remains ignored in an Oil/Gas Reservoir in general? Won't it be sensitive as we approach the Critical Point? Won't it be sensitive with applications such as Thermal EOR?
Also, Is it fine to consider the "Isothermal Compressibility" to be a Point Function in a Petroleum Reservoir?
Think about your question for a moment: If you are in a known HC reservoir, it has to be sealed or else your HC would have leaked out...right? Therefore volume expansivity is not possible...there is no place available to expand. If temperature or pressure increases either inside or outside of the reservoir, the internal pore pressure will increase within the reservoir.
in the volumetric calculation when HC reserves originally calculated temperature and pressure is taken into account in calculating the expansion factor.
when development starts if nothing is injected i guess only pressure will change while temperature tend to be the same (Geothermal gradient will not change). unless, something is injected inside the reservoir so the temperature of the injected fluid should be measured outside on the surface and down hole to account for heat(gain/loss) depending on the nature of the injected fluid
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