Acoustic Fluid Logger and Pressure Pulse Gas Gun
15
Pressure Pulse Gas Gun – Quick Instructions
Shooting a positive pressure wave:
•
Push the shuttle valve to the “Load” position.
•
Insert hose from the CO
²
bottle into the “Fill” connection on the gun. As you do this,
pressure will increase on the gauge.
•
When the desired pressure is reached, remove the hose connection from the fill
connection. A
suggested shot size
is 100 to 200 psi above wellbore pressure.
•
To fire the Pressure Pulse Gun, push the shuttle valve to the “Fire” position.
Shooting a reverse pressure wave:
Most wells with a casing pressure of above 100 psi can be shot using a reverse pressure wave.
(this means letting gas travel from the well into the volume chamber of the gas gun).
•
Place the shuttle valve in the load position.
•
Open the pressure bleed to bleed gas from the internal volume chamber.
•
Close the pressure bleed and move the shuttle valve to the “Fire” position. (You will
notice that the gauge on top of the gas gun suddenly travels from zero to whatever the
existing pressure is inside the casing.)
•
This has produced a reverse pressure wave. The fluid level will also be reversed on
the paper tape printout, and will kick UP on the paper tape, instead of kicking down as
it does in a positive pressure wave.
To remove the Pressure Pulse Gas Gun from the casing:
•
Close the casing valve.
•
Check to ensure that the gas gun shuttle valve is in the “Fire” position.
•
Check that the pressure bleed is open. Remove the gas gun from well using the
spanner wrench.
Safety notice: If the Pressure Pulse Gun has been left in the “Load” position while opening
the pressure bleed, you have only vented the gas inside the gun. Gas at pressure is still present
between the gas gun and the casing valve. To remove this gas, open the pressure bleed and move the
shuttle to the “Fire” position.
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