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Depending on context may mean:


The difference between cumulative production and cumulative offtakes is that cumulative offtakes recalculates produced surface volumes to sandface conditions and accounts for the shrinkage factors and cross-phase exchange coefficients dependence on formation pressure 

LaTeX Math Inline
bodyp_e(t)
 and formation temperature 
LaTeX Math Inline
bodyT_e(\tau)
 
which may vary over time:

Cumulative production

(no reference to the fluid)

Cumulative offtakes

(no reference to the fluid)

LaTeX Math Inline
bodyQ^{\uparrow}_p = \int_0^t q^{\uparrow}(\tau) d\tau

LaTeX Math Inline
bodyQ^{\uparrow}_{\rm off} = \int_0^t B(p_e(\tau), T_e(\tau)) q^{\uparrow}(\tau) d\tau


See Also

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Petroleum Industry / Upstream /  Production / Subsurface Production / Field Study & Modelling / Production Analysis

Cumulative OfftakesCumulative IntakesCumulative VRR