Pr meaning in oil and gas

Reservoir Pressure

Is the energy of the reservoir capable to flow the fluid held by the porous within itself from the Reservoir to Wellbore (BHFP “Bottom Hole Flow Pressure”) and from the Bottom well to Wellhead (WHFP “Well Head Flow Pressure”). All procedures can take place if there is a pressure differential DP. When the Reservoir Pressure is not enough to flow the fluids for a period of time that means the Reservoir Pressure is equal to wellbore pressure (DP=Pr-BHFP) as the Pascal Theory says, in a closed system the pressure is the same at all point of the system.