Tubular jar

{
  "id": "MLC-T-OAG-003949",
  "term": "Tubular jar",
  "field": "Oil and gas",
  "definition": "A downhole tool run as part of a workover or fishing string that delivers a sudden, high-impact axial blow to a stuck object. It stores energy, either mechanically in a spring or hydraulically in a fluid chamber, and releases it when a predetermined tensile or compressive load is applied. The impact force, which can exceed 100,000 pounds-force, is intended to free stuck packers, plugs, or other downhole components without over-pulling the workstring.",
  "subject": "Well Workover and Intervention",
  "url": "https://mlchart.com/terminology/oil-and-gas/tubular-jar/"
}