1. n. [Production Logging]

A technique for interpreting the results from a spinner flowmeter using only one logging run over the zone of interest. Spinner speed is related to fluid velocity using laboratory-determined values for threshold velocity and spinner response. The single-pass method is generally considered inferior to the in-situ multipass or two-pass method. However, in highly deviated and horizontal wells, where the logging tools must be deployed using coiled tubing or a tractor, the cost of an additional pass is high. Single-pass interpretation, with improved spinner characterization, has therefore become more common in recent years.

See: effective velocity,  flow profile,  multipass method,  spinner flowmeter,  spinner reversal,  threshold velocity,  two-pass method,  velocity correction factor