Acoustic Fluid Level Monitoring

The Echometer Well Analyzer is used in conjunction with a gas gun/microphone assembly to determine the liquid level depth in a well. Normally, the liquid level depth is determined in the casing annulus, but also, the liquid level depth can be measured inside tubing in gas wells. An acoustic pulse is generated at the surface of the well. The acoustic pulse travels through the gas and is reflected by changes in area including tubing collars and the liquid level. The software automatically processes this acoustic data to determine liquid level depth. Concurrent with the acoustic liquid level depth measurement, an initial and fifteen minute build-up casing pressure tests are performed. The casing pressure build-up measurement allows calculation of the casing annulus gas flow rate and the gradient of the gaseous liquid column, to determine if free gas is bubbling up through the liquid. Software calculates the producing bottom hole pressure, maximum production rates, pump intake pressure, casing annulus gas flow rate and other parameters. This single-shot acoustic liquid level depth test is displayed as shown so the operator can visualize and understand the performance of the well.

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Pumping Fluid Levels

The fluid level in a producing well can be determined using acoustics. Sound is introduced into the casing/tubing annulus and the reflected sound waves are recorded upon their return to the surface. An accurate fluid level is often used to:

  • Determine bottom-hole pressure
  • Help evaluate pump performance
  • Determine additional production potential
  • Assess operating changes

A fluid level reading, under stable conditions, is perhaps “the best single indicator of whether or not a pumping well is producing at its maximum capacity”.

“Move it to Prove it”

  • This is a short depression tests. A two shot fluid level with the casing valve closed to figure out the change in pressure over time. This will indicate if you have a true fluid level and not foam, wax plug or any other restrictions. (Please refer to “Fluid Depression Testing”).

Annular Fluid Depression Test

  • Eliminates guesswork
  • Accurate Bottom Hole Pressures


  • Tubing Hole Location
  • Wax & Scale BU
  • BHP