Annulus

{
  "id": "MLC-T-ENV-001744",
  "term": "Annulus",
  "field": "Environment",
  "definition": "1. Either the space between the casing of a well and the well bore or the space between the tubing and casing of a well. The annulus is also referred to as the \"annular space.\"\n\n2. The space between the drill pipe or casing and the wall of the drill hole; in rocks saturated with hydrocarbons, the annulus is the transition interval between the invaded zone and the uncontaminated zone.\n\n3. Either the space between the casing of a well and the wellbore or the space between the tubing and casing of a well.\n\n4. Space between the drill pipe or casing and the wall of the drill hole; in rocks saturated with hydrocarbons, the annulus is the transition interval between the invaded zone and the uncontaminated zone.",
  "subject": "Science and research",
  "references": [
    "Underground Injection Control Glossary",
    "Environmental Geophysics Glossary",
    "Glossary: Study of the Potential Impacts of Hydraulic Fracturing on Drinking Water Resources"
  ],
  "url": "https://mlchart.com/terminology/environment/annulus/"
}