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@wikipedia


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

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q(t)=q_{i} \cdotexp \left( 1+b \cdot D \cdot t-D_{\infty}t- \left( t/\tau \right)^{-1/b}n} \right)

where

LaTeX Math Inline
bodyq_i = q(t=0)

Initial production rate of a well (or groups of wells)

LaTeX Math Inline
bodyD=-\frac{1}{q}\frac{dq}{dt}_{\infty}


decline decrement at long times (the higher the

LaTeX Math Inline
bodyD
the stringer stronger is decline)

LaTeX Math Inline
body0 \leq b \leq 1

defines the type of decline (see below)


The cumulative production is then:

LaTeX Math Block
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Q(t)=\int_0^t q(t) dt

...

LaTeX Math Inline
bodyD=D_{\infty} + \frac{t^{n-1}}{\tau^{n}}

...

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...



See Also

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

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