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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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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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| 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
coefficient:
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Exponential | b = 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} |
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Harmonic | b = 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)}) |
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Hyperbolic | b = 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})
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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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