Acoustic liquid level tests are performed successfully in manydifferent applications throughout the world. Advancedtechniques for acoustic liquid level analysis are required forwells where unusual conditions exist such as very shallowliquid levels, annular partial obstructions, flush pipe, shorttubing joints, etc. Some wells have liners, upper perforations,paraffin, odd length of tubing joints, poor surface connectionsand other conditions which result in an acoustic trace that maybe very difficult to interpret. Normally, the computer softwarelocates the liquid level and automatically processes collarreflections to accurately count almost all of the collars fromthe initial blast to the liquid level. This automatic analysis willdetermine the liquid level depth for 95% of the wells.However, some wells have conditions or anomalies that theseprocedures will not function as desired. This paper describesspecial advanced techniques that can be used to determine theliquid level in wells with these unusual conditions.
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