Echometer Company Model – M Manual Phone: (940) 767-4334
5001 Ditto Lane Page 16 Fax: (940) 723-7507
Wichita Falls, Texas 76302, U.S.A. E-Mail: info@echometer.com
Operation of the Model M with the Compact Gas Gun
The compact gas gun is to be operated in the COMPRESSION (Explosion) or RAREFACTION (Implosion) mode. The
operator should use the Compression (explosion) technique when the casing pressure is less than approximately 100 psig.
The Rarefaction (implosion) technique may be used whenever the casing pressure is sufficient to obtain a good record.
COMPRESSION (EXPLOSION) MODE
Expansion of gas from the Echometer gas gun is used to generate a pressure pulse. The pressure pulse is positive since the
gas chamber is charged to a pressure that exceeds the well pressure by at least 100-psi.
1. Securely attach the Echometer Gas Gun to the Casing Valve.
2. Close the Casing Pressure Bleed Valve and Filler Bleed Chamber Valve.
3. Lift the Cocking Arm to close the internal gas valve. This prevents debris from entering the volume chamber.
4. Open the Casing Valve to the Echometer Gas Gun slowly and Close the casing valve to the flow line.
5. Measure the Casing Pressure using the precision pressure gauge.
6. Record Time and Casing pressure.
7. Fill the volume chamber with gas (CO2 or N2) to at least 100-psi in excess of the Casing Pressure.
8. Connect the coaxial cable from the microphone to the Input of the Model M.
9. Turn Power Switch to ON.
10. Select the type of collar response desired and set the gain controls to AUTO.
11. Turn chart drive ON.
12. Generate pressure pulse by pulling Trigger Ring, after “Generate Pulse” is displayed on chart.
13. Turn chart drive OFF after detecting the liquid level signal.
14. Inspect the record and repeat the shot if the signal quality is not satisfactory.
15. Turn power switch to OFF after operation.
16. Record Time and Casing Pressure.
17. Close the Casing Valve between Echometer Gas Gun and the well.
18. Open the Casing Pressure Bleed Valve and release the pressure.
19. Open the Casing Valve to the flow line.
20. Remove the Echometer Gas Gun from the casing valve.
RAREFACTION (IMPLOSION) MODE
Gas is released from the well into the gas gun volume chamber to generate the initial pulse. Debris, moisture, corrosive
liquids and chemicals, and other foreign material may be imploded into the gas gun volume chamber, which will increase
maintenance requirements and may cause corrosion on the inside of the volume chamber.
1. Securely attach the Echometer Gas Gun to the Casing Valve.
2. Close the Casing Pressure Bleed Valve and Filler Bleed Chamber Valve.
3. Open the Casing Valve to the Echometer Gas Gun slowly and Close the casing valve to the flow line.
4. Pull Trigger Ring.
5. Lift the Cocking Arm to close the internal gas valve.
6. Measure the Casing Pressure using the precision pressure gauge.
7. Record Time and Casing Pressure.
8. Bleed the gas chamber pressure through the Filler-Bleeder Chamber Valve by rotating the knob clockwise until the
gas gun pressure has decreased to approximately 200-psi below the casing pressure reading. Use greater or less
differential pressure depending on the quality of the recording.
9. Connect the coaxial cable from the microphone to the INPUT of the Model M.
10. Turn Power Switch to ON.
11. Select the type of collar response desired and set the gain controls to AUTO.
12. Turn chart drive ON.
13. Generate pressure pulse by pulling Trigger Ring, after “Generate Pulse” is displayed on chart.
14. Turn chart drive OFF after detecting the liquid level signal.
15. Inspect the record and repeat the shot if the signal quality is not satisfactory.
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