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The usual convention is to split pressure transient response in three major time intervals (see also Fig. 4):
| Early Time Response (ETR) | Middle Time Response (MTR) | Late Time Response (LTR) |
|---|---|---|
| Wellbore storage and well-reservoir contact effects | Unconstrained reservoir flow | Reservoir boundary effects |
|
Fig. 4. PTA Diagnostic Plot with ETR, MTR and LTR time zones. Pressure drop is in blue and log-derivative is in red. |
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