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The Exponential and Hyperbolic decline are applicable for Boundary Dominated Flow with finite reserves
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| body | --uriencoded--Q_%7B\rm max%7D \leq \infty |
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while
Harmonic decline is associated with production from the reservoir with infinite reserves
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| body | --uriencoded--Q_%7B\rm max%7D = \infty |
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.
In other words the Harmonic decline is very slow.
Since all physical reserves are finite the true meaning of Harmonic decline is that up to date it did not reach the boundary of these reserves and at certain point in future it will transform into a finite-reserves decline (possibly Exponential or Hyperbolic).
The Harmonic decline is also observed at the mature stage of waterflood projects.
Exponential Production Decline has a physical meaning of declining production from finite drainage volume
with constant
BHP:
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| body | p_{wf}(t) = \rm const |
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(a specific type of
Boundary Dominated Flow under
Pseudo Steady State (PSS) conditions).
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