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LaTeX Math Inline
bodyq_0 = q(t=0)

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

LaTeX Math Inline
bodyD_0 > 0

LaTeX Math Inline
bodya

model parameter characterizing production decline

LaTeX Math Inline
bodyn

model parameter characterizing production decline

LaTeX Math Inline
body--uriencoded--\displaystyle D(t) =- \frac%7Bdq%7D%7BdQ%7D

production decline rate

LaTeX Math Inline
body--uriencoded--\displaystyle Q(t)=\int_0%5et q(t) dt

cumulative production


Harmonic Production Decline is an empirical correlation for production from a infinite-reserves Qmax=Qmax=∞ reservoir. 


Alternative form

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The original form was developed as correction of Arps for tight gas and shales: 

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