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@wikipedia  


Mathematical model predicting the fluid production from a reservoir based on the past production/injection history.

It can be applied to any fluid production: water, oil or gas.A means of predicting future oil well or gas well production based on past production history. 

It does not involve the knowledge of formation pressure or  or bottom-hole pressure and is solely based on production/injection history data.

This comes as advantage in quick estimation of production perspectives and as disadvantage in accurate long-terms predictions.


There are many popular decline metrics, including the most popular:

Arpsconventional reservoirs
Duongtight gas, shales
Power Lawtight gas, shales
Neural Networkwide-range


The first historically and the most popular decline curve methodology is Arp's popular Decline Curve Analysis methodology in conventional reservoirs is Arps decline model:

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Fig. 1.
Arp's Exponential decline
 Exponential Production DeclineFig. 2.
Arp's Harmonic decline
 Hyperbolic Production DeclineFig. 3.
Arp's Hyperbolic decline

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See Also

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Petroleum Industry / Upstream /  Production / Subsurface Production / Field Study & Modelling / Production Analysis / Analytical Production Forecast

DCA Arps @model

DCA Power Law @model


References

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DCA @petrowiki

DCA @fekete