Theory And Applications Of The Borehole Audio Tracer Survey Available to Purchase

The Borehole Audio Tracer Survey (BATS or sound survey) is a new surveying device which can be used to locate and quantify fluid flow outside of casing. Additionally the sound* logger can be utilized as a flowmeter (without moving parts) to measure fluid flowing past the tool. Part I illustrates use of the BATS log to locate and evaluate the quantity of fluid flow outside of casing. It is demonstrated that an index of flow magnitude can be determined and, as a result, a monetary value can be placed on this lost production. Part II demonstrates the use of the BATS log to determine the relative flow rate of individual perforations in limited entry completion, where mass flow rate through the perforation is sufficient to produce turbulent flow. An additional technique for evaluating perforated zones (e. g. 4 per ft., etc.) is also shown. Part III demonstrates use of the BATS device as a downhole flowmeter having no moving parts. It is shown that the BATS device, unlike mechanical flowmeters, can, under favorable circumstances, identify the type of fluid flowing (e. g. liquid, liquid-gas, or foam) as well as the flow rate.