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| Exponential | Harmonic | Hyperbolic |
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| LaTeX Math Block |
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| q(t)=q_{i} \exp \left( -D \, t \right) |
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| LaTeX Math Block |
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| q(t)=\frac{q_{i}}{1+D \, t} |
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| LaTeX Math Block |
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| q(t)=q_{i} \cdot \left( 1+b \cdot D \cdot t \right)^{-1/b} |
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| LaTeX Math Block |
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| Q(t)=\frac{q_{i}-q(t)}{D} |
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| LaTeX Math Block |
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| Q(t)=\frac{q_{i}}{D} \, \ln \left[ \frac{q_{i}}{q(t)} \right] |
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| LaTeX Math Block |
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| Q(t)=\frac{q_{i}}{D \, (1-b)} \, \left[ q_{i}^{1-b}-q(t)^{1-b} \right]
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Arps decline only work for Boundary Dominated Flow.
Exponential decline has a physical meaning of declining production from finite drainage volume
with constant
BHP:
| LaTeX Math Inline |
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| body | p_{wf}(t) = \rm const |
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