Total injection of gas from the beginning of injection $\begin{array}{l}t_0\end{array}$ until current moment of time $\begin{array}{l}t\end{array}$ :

(1)	$\begin{array}{l}\displaystyle Q^{\downarrow}_{GI}(t)=\int_{t_0}^t q^{\downarrow}_{GI}(\tau) d\tau\end{array}$

where

$\begin{array}{l}q^{\downarrow}_{GI}(\tau)\end{array}$

gas injection rate at time moment $\begin{array}{l}\tau\end{array}$

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