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 |
Fig. 5. Drawdown pressure transient as response to production rate increase
| injection rate decrease (#1) and to shutting down the injection (#2). |
See Also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing
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