Phase velocity log

{
  "id": "MLC-T-OAG-002773",
  "term": "Phase velocity log",
  "field": "Oil and gas",
  "definition": "A production log that records the velocity of an individual fluid phase, usually oil or water, moving in a flowing well. One common method ejects marker fluids carrying a neutron-absorbing compound such as gadolinium into each phase and times their arrival at a pulsed-neutron capture detector a known distance away. Velocity is the ejector to detector spacing divided by the travel time, and gas velocity is not measured this way.",
  "subject": "Production Logging",
  "url": "https://mlchart.com/terminology/oil-and-gas/phase-velocity-log/"
}