The Duong analysis was developed specifically for unconventional reservoirs with very low permeability. The shape of the curve is suited for wells that exhibit long periods of transient flow. The Duong method will reach a finite EUR, and tends to be more conservative than traditional Arps declines with b > 1.
| The Duong Production Decline Model | ||
| q = |
|
Rate expression as a function of time |
| Q = |
|
Cumulative production as a function of time |
| EUR = |
|
EUR in terms of model parameters |
| Reference SPE paper 137748. | ||