Packer Inflation Pressure Formula

For Inflation with Nitrogen Gas or Air

G = Inflation pressure at gauge (psi)
Dp = Depth to top of packer
Dw = Depth to static water level in well (feet)
Sp = Unconfined packer pressure rating for the well size (psi)
Pp = Injection pump pressure (PSI)

1. To Calculate Packer Inflation Pressure for a withdraw test (pump out):
   
   G = (Dp-Dw x .43) + Sp + [(Dp-Dw x .43) x .2}]

   Note: This total must not exceed confined packer pressure rating for the well size.

2. To Caculate Packer inflation Pressure for an injection test (pump in):

       (.43 water | .6 grout)
   

   G = [(Dp x PSI per foot of Injected Fluid) + Sp + Pp] x 1.1

   Note:This pressure must not exceed confined packer pressure rating plus (Dp-Dw) x .43