A gas borehole flowmeter providing high resolution flow measurement is being developed to support natural gas production enhancement research within the United States Eastern Devonian Shale. The flowmeter utilizes ultrasonic technology which will provide excellent resolution and measurement accuracy. Early developmental test data indicate that the tool will be able to measure very low flow rates produced by borehole gas entry before fracture, i.e., .009 dm3/s (0.02 cfm). The use of time-of-flight dual transceivers will provide accurate gas velocity and flow measurements previously unavailable.

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