Synonym: Pressure Transient = Pressure Transition
Wellbore and reservoir pressure transition from one flow regime to another caused by the change in flow rate in the same well (Fig. 1 – Fig. 4) or remote well (Fig. 5 – Fig. 6).
Also called Unsteady State.
Represent the basic data input to Pressure Transient Analysis.
A popular convention for pressure transient data analysis is PTA Diagnostic Plot.
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Fig. 1. Drawdown pressure transient as response to opening a well for production (#1) and to production rate increase (#2) | Fig. 2. Build-up pressure transient as response to production rate decrease (#1) and to shutting down the production (#6). |
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| Fig. 3. Injection pressure transient as response to opening a well for injection (#1) and to injection rate increase (#2) | Fig. 4. Fall-off pressure transient as response to injection rate decrease (#1) and to shutting down the injection (#2). |
See Also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing
[ Well & Reservoir Surveillance ] [ Pressure Diffusion ] [ Pressure Transient Analysis (PTA) ]