Power Law mathematical model of Decline Curve Analysis is based on the following equation:

(1)	$\begin{array}{l}\displaystyle q(t)=q_0 \cdot \exp \left( -D_{\infty}t- \left( t/\tau \right)^{n} \right)\end{array}$

where

$\begin{array}{l}q_0 = q(t=0)\end{array}$	Initial production rate of a well (or groups of wells)
$\begin{array}{l}D_{\infty}\end{array}$	decline decrement at long times (the higher the $\begin{array}{l}D\end{array}$ the stronger is decline)

The cumulative production is then:

(2)	$\begin{array}{l}\displaystyle Q(t)=\int_0^t q(t) dt\end{array}$

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