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Sage Technologies, Inc.
 (817) 488-2579
toll-free in U.S. (877) 488-2579

Frequently Asked Questions

Gas Guns

Q. Where can I get my CO² bottle filled with gas?

A. There are many local fire extinguisher stores, welding supply or oilfield supply stores that will fill the bottle. Simply have the gas store weigh the bottle when empty, then fill it with 2.5 pounds of compressed gas. If you are having trouble locating compressed gas, try a gas supply house like Airgas at, welding supply store or even a paintball or sporting goods store.

Q. Can you ship me the bottle filled with gas?

A. No. Current shipping regulations prohibit shipment of compressed gas in these cylinders In addition, all compressed gas must be bled from the cylinder before shipment.

Q: I have an older model gas gun from another manufacturer that uses blank shotgun shells. It is getting harder to find the blanks, and the gun is getting old. Can you replace it?

A: Yes. While blank shotgun shells were once used to literally fire a shot down a wellbore to find a fluid level, the shells can be dangerous to ship and to use. For economy and safety, it makes sense to replace these older guns with Pressure Pulse Gas Gun, which uses compressed bottle gas -- carbon dioxide or nitrogen -- to fire a shot down the wellbore.

Q: How do I know if the gas gun is leaking?

A: After pressuring up the gun, does the gauge on the top of the gun continue falling in pressure? If so, you probably need to rebuild the gun. Try to determine where the leak is originating. There are several key spots on the gun to check if a leak is suspected.

  • If the leak originates in the shuttle valve load or fire area, examine the o-rings on the sliding shuttle valve and replace them if damaged.
  • If the leak originates in the fill valve area, examine the fill valve for damage, and also replace the valve core under the fill valve.
  • If the leak originates in the microphone connection area, examine and replace o-rings on the microphone stem.

Q: How do I know if the microphone is working on my gas gun?

A: If the signal onscreen remains flat after shooting the shot, the microphone in the gas gun may be dead and may need to be replaced.

  • First, check the microphone cable for secure connection to both the fluid logger and to the gas gun. Also, look inside both ends of the microphone cable, to see if the metal pin inside the connection has been broken or damaged.

  • Remove the microphone from the gun, by removing the microphone bolt inside the base of the gun and pulling the microphone from the bottom of the gun. Hold the microphone on the stainless steel portion, being careful not to press on the round microphone discs, which cover the sensitive microphone crystals. Examine the discs for damage. A blown-out or caved-in disc indicates that the microphone needs to be replaced.
  • If the microphone discs (sides) do not look damaged, but are full of debris and dirt, wipe down the microphone to remove the dirt. Use caution in cleaning microphone: Carefully wipe off the microphone head and discs with a cloth or paper towel. Heavy dirt and debris on the discs can stop the microphone from operating properly. If necessary, spray with a light lubricant like WD-40 and shake off excess. Do not soak in water. Warning: DO NOT USE chemical solvents, as they can permanently damage the microphone.  Do not press on the microphone faces, as this can permanently damage the sensitivity of the microphone.
  • Examine the o-rings on the microphone stem for damage. If o-rings are cut or damaged, replace them; lubricate the new o-rings with silicone lubricant or o-ring grease, then re-insert the microphone in the gas gun and tighten the microphone bolt. Repeat the well test to see if sensitivity has been improved. If not, the microphone needs to be replaced. Warning: To lubricate o-rings, use silicone lubricant or gear oil only. DO NOT USE Vaseline-type products, pipe dope or solvents, as all can permanently damage o-rings.

Q: Why didn’t I get a shot from the gun?

A: Check your connections.

  • Check the gas bottle for CO² -- is it empty?
  • Check the gun gauge for pressure before the shot -- did you charge up the gun?
  • Check the microphone cable connections to the gun and to the fluid logger -- is it securely connected? Is the microphone cable fully connected to both the fluid logger and to the gun?
  • Is the USB connecter attached to the portable computer and to the Acoustic Fluid Logger IV?
  • Is the fluid logger turned on? Is the computer turned on?
  • Is the battery charged – on both the fluid logger and on the computer?

Q: What size shot should I use for the fluid level test?

A: Well depth and other variables will affect the amount of pressure needed to charge the gun for a fluid level shot .In general, a shot of 100 to 200 psi above wellbore pressure should be sufficient for shallow wells; use 300 to 400 psi above wellbore pressure for deeper wells.

Fluid Loggers

Q: Why won’t the Acoustic Fluid Logger unit come on?

A: Several checks should be made if the logger will not power on.

  • Is the unit turned on? On the AFL IV or Dynamometer, check for the on/off bulb to light when the unit is turned on. On the AFL III, check to make sure the unit advances the paper roll. If you can answer "no" to these questions, then the battery may need replacement.

  •  Is the battery charged? Try charging the unit for several hours or overnight. If the unit still won't turn on, the battery probably needs to be replaced.  AFL IV or Dynamometer batteries are available from Sage Technologies. AFL III batteries are also available, or a standard motorcycle battery can serve as a  replacement for this logger only. Follow pictures and instructions in the product manual for battery replacement. You can also ship the unit to Sage Technologies for cleaning, calibration and battery replacement. We pride ourselves on quick turnaround time on repairs.

Q. Can I add a pressure transducer to my system?

A: Pressure transducers can be added to the Acoustic Fluid Logger IV or AFL IV with Dynamometer, to record surface pressure buildup before the shot and automatically calculate the gas afterflow. The pressure rating of the transducer should match the pressure rating of the gas gun being used with the system (1,500 psi or 3,000 psi) because the pressure transducer connects to the top of the gun through the quick-connect, in place of the gun's pressure gauge.

AFL Software

Q: Why can't I see the fluid level on the computer screen?

A: Try zooming in on the Red or Blue Cursors on the graph. On the Depth Scan tab, there are several ways to zoom into a selected part of the graph, using the Graph Manipulation tools (three boxes on the upper left corner of the fluid level graph). Click on the left icon, which looks like a small graph, to then click on and move the red and blue cursors. Click on the middle icon, the magnifying glass image, to bring up the Zoom Option box, with allows even more movement within the fluid level graph. Click on the hand icon to grab a spot on the graph and scroll it from side to side.

Q: What affects collar readability?

A: Shallow wells are the easiest on which to count the collars all the way down to the fluid level. Wells with higher casing pressure are easier than low pressure wells, i.e. wells under 15 psig. The tighter the fit between the casing and the tubing collars, the harder it is to get deep collars. Slim hole completions are some of the toughest, as it is very hard for the shot to make its way down the annulus area. Prevent excessive movement of the microphone cable or stepping on the microphone cable during the well test, as both can cause false echoes.

Q: Will the software run on my computer?

A. The Sage AFL and Sage DYN software is designed to run on Windows10, Win8, Win7 and Windows XP. (Note: If you are running a Windows 7 operating system, you should have received and installed the updated software that has been sent to all existing AFL IV operators.) If you have misplaced your software disc, call to request a disc or USB stick with replacement software: Sage Technologies - 817-488-2579 or email

Q: How do I print out a report of the fluid level data?

A: In the Acoustic Fluid Logger Software, go to the Report Generation tab. From the box of Available Items, choose which items to include in your fluid level report and move them to the Included Items box. Click Generate Report, choose the output location, and click OK.

Q. How do I send a PDF file?

A: On the Report Generation tab, on the dialogue box that appears when you click the Generate Report button, you will notice the CutePDF Writer, which was automatically installed on your computer with the Acoustic Fluid Logger Software. Select the CutePDF Writer if you wish to produce a .pdf file report. The CutePDF Writer will save the fluid level report to an Adobe PDF file suitable for email transmission.


Q. Can I add a dynamometer to my existing Acoustic Fluid Logger system?

A: Contact Sage Technologies to discuss compatibility or trade-in of your existing AFL recorder. The Pressure Pulse Gas Gun is compatible with all Sage fluid loggers and dynamometers.


Changing a battery

Battery changing photos are available in the product manuals on the Downloads tab.

Examples using actual field data are also available on the Downloads tab.

For an example of real data in use with the AFL IV see:

  •  Example One -- Acoustic Fluid Logger IV - high fluid level

For an example of real data in use with the AFL IV with Dynamometer see:

  • Example Two -- AFL IV with Dynamometer - worn plunger and worn traveling valve