MLchartDataset catalogue

Microannulus

Term · Oil and gas · MLC-T-OAG-002349

A small, often microscopic, gap that forms between the cement sheath and the casing or formation wall in a wellbore. This gap can result from thermal expansion and contraction, pressure changes, or poor cementing practices. A microannulus can provide a pathway for fluid migration, potentially leading to sustained casing pressure or communication between different zones.

Table 1. Record
IdentifierMLC-T-OAG-002349
FieldOil and gas
SubjectWell Completions
Record as JSON 
{
  "id": "MLC-T-OAG-002349",
  "term": "Microannulus",
  "field": "Oil and gas",
  "definition": "A small, often microscopic, gap that forms between the cement sheath and the casing or formation wall in a wellbore. This gap can result from thermal expansion and contraction, pressure changes, or poor cementing practices. A microannulus can provide a pathway for fluid migration, potentially leading to sustained casing pressure or communication between different zones.",
  "subject": "Well Completions",
  "url": "https://mlchart.com/terminology/oil-and-gas/microannulus/"
}

Record 2,505 of 4,468 in Oil and gas terminology (MLC-0103). Request the full dataset.