Drift

{
  "id": "MLC-T-OAG-001175",
  "term": "Drift",
  "field": "Oil and gas",
  "definition": "The angle by which a wellbore departs from vertical, measured in degrees from the vertical axis. In tubular work, drift also means the guaranteed minimum bore of a pipe, checked by pulling a cylinder of set diameter, called a drift mandrel or rabbit, through it. The drift diameter is slightly smaller than the nominal inside diameter, so it sets the largest tool that can pass.",
  "subject": "Drilling",
  "url": "https://mlchart.com/terminology/oil-and-gas/drift/"
}