Acrylamide acrylate polymer

{
  "id": "MLC-T-OAG-000052",
  "term": "Acrylamide acrylate polymer",
  "field": "Oil and gas",
  "definition": "A copolymer of acrylamide and acrylate, usually sold as partially hydrolyzed polyacrylamide (PHPA), added to water-based mud to coat shale cuttings and borehole walls, which slows hydration and dispersion of reactive clays. It also raises the yield of low-bentonite muds as a clay extender and flocculates fine solids in clear-water drilling. The share of acrylate groups and the molecular weight set its tolerance to salt and temperature, and low-molecular-weight grades act as deflocculants instead.",
  "subject": "Drilling Fluids",
  "url": "https://mlchart.com/terminology/oil-and-gas/acrylamide-acrylate-polymer/"
}