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Arp's mathematical model of Decline Curve AnalysisМетод Арпс (Arps) является исторически первым и до сих пор одним из самых популярных на практике методом предсказания динамики добычи без привлечения сведений о давлении в пластах. 
В основе метода лежит следующая эмпирическая формула для дебита is based on the following equation

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q(t)=\frac{q_{i}}{[1+b \, D \, t]^{\frac{1}{b}}}

Коэффициент where

а коэффициент 

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bodyq_i = q(t=0)

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


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D=-\frac{1}{q}\frac{dq}{dt}

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decline decrement (the higher the

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bodyD

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the stringer is decline)

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bodyb

defines the type of decline (see below)

The cumulative production is then

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:

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Q(t)=\int_0^t q(t) dt


Arp's model splits into four types based on the value of 

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 coefficient:





Exponentialb = 1


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q(t)=q_{i} \exp \big [ -D \, t \big ]


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Q(t)=\frac{q_{i}-q(t)}{D}


Harmonicb = 0


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q(t)=\frac{q_{i}}{[1+D \, t]} 


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Q(t)=\frac{q_{i}}{D}\ln (\frac{q_{i}}{q(t)})


Hyperbolicb = 0..1


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q(t)=\frac{q_{i}}{[1+b \, D \, t]^{\frac{1}{b}}}


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Q(t)=\frac{q_{i}}{D \, (1-b)}(q_{i}^{1-b}-q(t)^{1-b})


Power Loss


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D=D_{\infty} + \frac{t^{n-1}}{\tau^{n}}



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q(t)=q_{i} \exp \big [ -D_{\infty}t- \bigg(\frac{t}{\tau} \bigg)^{n} \big]


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