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The major difference between cumulative offtakes and cumulative production is that cumulative offtakes accounts for the shrinkage factors and cross-phase exchange coefficients which depend on formation pressure
and
formation temperature and may vary over time:
Cumulative offtakes (no reference to the fluid) | Cumulative production (no reference to the fluid) |
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| LaTeX Math Inline |
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| body | Q Q^{\uparrow}_{off} = \int_0^t B(p(\tau), T(\tau)) qq^{\uparrow}(\tau) d\tau |
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| | LaTeX Math Inline |
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| body | Q Q^{\uparrow}_p = \int_0^t qq^{\uparrow}(\tau) d\tau |
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