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WFP = – Well Flow Performance Performance is a specialized analysis of correlation between surface flowrate and wellbore pressure as function of formation pressure and associated production optimization procedures.
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It's important to remember the difference between constant rate flow and stabilized flow stabilised flow.
The stabilized flow may have a changing stabilised flow may go through a gradually changing flow rate due to formation pressure change, while the productivity index stays consantconstant.
On the other hand, the constant flow rate flow may not represent a stabilsed flow stabilised flow as the bottom-hole pressure and productivity index maybe still in transition after the last rate change.
that constant flowrate is NOT a
In case the constant rate flow is stabilised the well is called flowing in steady state regime.
The WFP methods are not efficient if the well flow is not stabilised even if the rate is maintained constant. Важно учитывать, что постоянство дебита скважины не является однозначный признаком стационарного режима.
Скважина с постоянным дебитом может находиться в переходном режиме, когда перепад между пластовым и забойным давлением продолжают меняться, а вслед за ними и продуктивностью скважины продолжает меняться и стандартный аппарат АПС будет не эффективен для анализа оптимального режима эксплуатации скважины.
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