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Reservoir flow around the well with well productivity index is not changing over time.

It's important to remember the difference between constant rate reservoir flow and stabilised reservoir flow.

There should be no confusion between stabilised reservoir flow and constant-rate production.

Constant-rate production may not represent stabilised reservoir flow as productivity index maybe still in transition after the last rate change.

On the other hand, a stabilised reservoir flow may AnchorConstantRateConstantRateThe stabilised formation flow may go through a gradually changing flow rate due to formation pressure change , while the with 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 staying constant.

The WFP methods are not applicable if the well flow is not stabilised even if the flow rate is maintained constant. 

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