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The late time interval of the 
pressure transitions during which bottom-hole pressure is evolving under Boundary Dominated Flow (BDF) well flow regime (see LTR at Fig. 1)

Fig. 4. PTA Diagnostic Plot with ETR, MTR and LTR time zones.

Pressure drop is in blue and log-derivative is in red.

See Also


Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing / Pressure Transient Analysis (PTA) /  PTA Diagnostic Plot

Well & Reservoir Surveillance ] [ Pressure Diffusion ] [ ETR ] [ MTR ]


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