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 offset activity (Fig. 5 – Fig. 6).
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Fig. 1. Drawdown pressure transient as response to production rate increase | Fig. 2. Build-up pressure transient as response to production rate decrease |
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Fig. 3. Fall-off pressure transient as response to injection rate increase | Fig. 4. Injection pressure transient as response to injection rate decrease |
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Fig. 5. Drawdown pressure transient as response to production rate increase | Fig. 6. Build-up pressure transient as response to production rate decrease |