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| Arps @model | conventional reservoirs |
| Duong | tight gas, shales |
| Power Law | tight gas, shales |
| Multi-segment | wide-range |
The first historically and the most popular decline curve methodology is Arp's decline modelin conventional reservoirs is Arps decline @model:
| Fig. 1. Arp's Exponential decline | Fig. 2. Arp's Harmonic decline | Fig. 3. Arp's Hyperbolic decline |
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