The initial late time interval of the pressure transient dominated by wellbore storage and hydraulic fracture effects pressure transitions during which botom-hole pressure is evolving under Boundary Dominated Flow (BDF) well flow regime (see LTR at Fig. 1)
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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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