Final Flowing Pressure (pwfo)

Final flowing pressure is the flowing pressure at the end of a drawdown or injection period, or alternately the pressure just before shut-in. When performing a radial analysis, it has a direct affect on the calculation of total skin (s'). 

For modeling, it is used as a default anchor point pressure. Thus, it is important to ensure that shut-in periods are placed correctly to ensure a valid analysis and model.