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.