Sheen

{
  "id": "MLC-T-OAG-003370",
  "term": "Sheen",
  "field": "Oil and gas",
  "definition": "A thin, iridescent film of free oil that spreads across a water surface, indicating hydrocarbon contamination in drilling fluids or cuttings. The appearance of a sheen during operations with water-based mud signals an influx of formation oil or contamination from lubricants. Environmental regulations, such as the U.S. EPA's static sheen test, prohibit the discharge of any materials that cause a visible film or discoloration on the receiving water.",
  "subject": "Drilling Fluids",
  "url": "https://mlchart.com/terminology/oil-and-gas/sheen/"
}