Reservoir Pressure and or Downhole Pressure
Reservoir Pressure and or Downhole Pressure : The pressure at the face of the producing formation when the well is shut in. It is equal to the shut-in pressure (at the wellhead) plus the weight in pounds of the column of oil in the hole. The hydrostatic pressure exerted by a column of oil 5,000 feet high, for example, would be several thousand pounds. In a flowing well, the reservoir pressure would be sufficient to overcome the pressure of the hydrostatic head