1. n. []

A device for measuring in situ the velocity of fluid flow in a production or injection well in which the flow is diverted through the spinner by a set of metal vanes, or petals. The vanes are closed while running in the hole, and then opened with the tool stationary at the measurement depth. The petals do not seal completely against each other or against the side of the hole, so that not all the fluid is diverted. A type of diverter flowmeter, the petal basket design has generally been replaced since the late 1980s by the inflatable diverter and other designs.

Synonyms: basket flowmeter

See related terms: in situ,  packer flowmeter,  spinner flowmeter