Reverse circulating valve

{
  "id": "MLC-T-OAG-003148",
  "term": "Reverse circulating valve",
  "field": "Oil and gas",
  "definition": "A downhole tool that allows drilling fluid to be pumped down the annulus and up through the drill pipe, reversing the normal circulation path. This valve is used to clean out the wellbore, retrieve lost tools, or circulate out heavy debris that cannot be lifted by conventional circulation. It is activated by dropping a ball or by applying specific pressure cycles.",
  "subject": "Well Completions",
  "url": "https://mlchart.com/terminology/oil-and-gas/reverse-circulating-valve/"
}