One of mathematical models of Decline Curve Analysis based on the following equations:

(1)	$\begin{array}{l}\displaystyle q(t)=q_0 \cdot \exp \left[ - \int_0^t D(Q(t)) \, dt \right]\end{array}$

(2)	$\begin{array}{l}\displaystyle D(Q) = {\rm ANN}(Q)\end{array}$

where

$\begin{array}{l}q_0 = q(t=0)\end{array}$	Initial production rate of a well (or groups of wells)
$\begin{array}{l}\displaystyle D(t) =- \frac{dq}{dQ}\end{array}$	Production decline rate
$\begin{array}{l}\displaystyle Q(t)=\int_0^t q(t) dt\end{array}$	cumulative production
$\begin{array}{l}{\rm ANN}(Q)\end{array}$	artificial neural-network regression of Production decline rate $\begin{array}{l}D\end{array}$ on cumulative production $\begin{array}{l}Q\end{array}$

DCA ANN is an empirical correlation for production from both finite-reserves $\begin{array}{l}Q_{\rm max} \leq \infty\end{array}$ or infinite-reserves $\begin{array}{l}Q_{\rm max} = \infty\end{array}$ reservoirs.

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DCA ANN @model

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