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Question: How is the remote fire gas gun lubricated?
Answer: The remote fire gas gun has a 12 volt solenoid valve which actuates and opens a small nylon dart valve. When the small dart valve is open or leaking, gas is released from the small 1/8" hole located beside the pressure gauge. When gas is bled from this opening, the 1/2" gas valve opens and gas is released from the gas gun volume chamber through a 3/8" orifice into the well. The 1/2" gas valve contains two o-rings which must be lubricated. One o-ring is on the 1/2" outer diameter of the gas valve, and the other o-ring seals into the 3/8" orifice.
The 1/2" gas valve and two o-rings can be lubricated using the following procedure. First, charge the remote fire gas gun to approximately 200 PSI. Use the Well Analyzer to fire the gas gun. It should create a distinct sharp pulse. When the remote fire gas gun is fired, the 1/2" gas valve is pushed back by gas pressure away from the 3/8" orifice which is sealed by the 1/2" gas valve. If the threaded end of the remote fire gas gun is held upward, oil can be dropped into the discharge tube. The oil will flow down the discharge tube into the inner parts of the gun and lubricate the 1/2" gas valve and two 0-rings. Approximately 20 drops of oil should be dropped into the discharge tube to insure that the gas valve is properly lubricated. After lubricating the 1/2" gas valve, charge the gas gun to 200 PSI and fire the gas gun. Repeat charging and firing the gas gun several times. The acoustic pulse from the gas gun should sound sharp. The gun should be tested for proper operation by shooting the gas gun into the atmosphere anytime that operation of the gas gun is questionable.
Sand, debris, water vapor and other materials in the well must not be allowed to enter the remote fire gas gun inner parts. If debris is allow to enter the gas gun, the small dart valve will leak gas from the small 1/8" opening beside the pressure gauge and cause improper operation. The gas gun may require disassembly to remove the debris and clean the gas gun. The remote fire gas gun should be charged to a pressure in excess of well pressure before the casing valve is opened to prevent sand, debris and water vapor from entering the inner parts of the gas gun. This will greatly reduce gas gun maintenance and result in better gas gun performance.