multipass method

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A technique for interpreting the results from a spinner flowmeter using several logging runs of the flowmeter over the zone of interest at different speeds, both up and down. Spinner speed is a nearly linear function of the effective velocity of the fluid. Although this function can be measured on surface, it varies with the fluid and is most reliably determined in situ. After several passes are made, the function can be calibrated and the spinner speed converted into flow rate. The technique is applicable when the flow is single phase, or else multiphase with a sufficiently homogeneous flow regime such as with emulsion or dispersed bubble flow.

See: bubble floweffective velocityflow profileflow regimesingle-pass methodspinner reversalthreshold velocitytwo-pass methodvelocity correction factor