Drop bar

{
  "id": "MLC-T-OAG-001201",
  "term": "Drop bar",
  "field": "Oil and gas",
  "definition": "A heavy, cylindrical weight dropped from the surface into the wellbore to mechanically activate a downhole tool by impact. The bar travels down the tubing or drill pipe until it strikes a firing head or other mechanism on the tool, initiating its operation, such as setting a plug or firing a perforating gun. Drop bars are used when hydraulic activation is not feasible.",
  "subject": "Perforating",
  "url": "https://mlchart.com/terminology/oil-and-gas/drop-bar/"
}