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WFP is performed on stabilised wellbore and reservoir flow and does not cover transient behavior which is normally covered in one of the primary subjects of Well Testing domain.
The wellbore flow is called stabilised if the delta pressure across wellbore is not changing over time.
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It's important to remember the difference between between constant rate formation flow and stabilised formation flow.
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The stabilised formation flow may go through a gradually changing flow rate due to formation pressure change, while the productivity index stays constant.
On the other hand, the constant rate formation flow may not represent a stabilised formation flow as the bottom-hole pressure and productivity index maybe still in transition after the last rate change.
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