A [[spinner]]-type velocimeter which utilizes an inflatable packer bag. After the proper-size bag is pumped up to fill the [[annulus]] between tool and casing, all the fluid is diverted through the spinner assembly which measures the velocity of the fluid, which, in turn, is related to the volumetric flow rate. A profile in bbl/day for either "up or down" flow is recorded; also flow direction. The profiles are determined by fixed point recordings. The tool operates at lower rates than the minimum required for a [[continuous flowmeter]].

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