Borehole flowmeter. Final technical report, February 1984-October 1987

A Prototype Borehole Flowmeter has been developed for the purpose of characterizing gas-flow distributions within Devonian Shale gas wells. Current technology for locating and measuring the gas-producing zones in the Devonian Shale well environment is indirect and inadequate due to the low flow rates involved. The ultrasonic flowmeter uses the time-of-flight approach to measure gas flow. Features incorporated in the borehole system include: (1) ultrasonic flowmeter, (2) temperature and pressure sensors, (3) gamma-ray counter, and (4) X-Y volumetric caliper. Bench testing of sonic transmitter/receiver components has verified the feasibility of the design approach. A prototype system was fabricated for use in the .1 to 10 foot per second range of gas flow. The prototype was tested in five wells.