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  • What is PHPA mud?
  • [Drilling Fluids] A class of water muds that use partially hydrolyzed polyacrylamide (PHPA) as a functional additive, either to control wellbore shales or to extend bentonite clay in a low-solids mud. As a shale -control mud, PHPA is believed to seal microfractures and coat shale surfaces with a film that retards dispersion and disintegration.
  • What is PHPA (powder form)?
  • PHPA (powder form) is a readily dispersible additive designed to provide cuttings encapsulation and shale stabilization in freshwater to saltwater drilling fluids ranging from low solids to weighted muds.
  • Is PHPA a shale control mud?
  • As a shale -control mud, PHPA is believed to seal microfractures and coat shale surfaces with a film that retards dispersion and disintegration. KCl is used as a shale inhibitor in most PHPA mud designs.
  • Is PHPA a encapsulating polymer?
  • PHPA is a synthetic long chain copolymer based upon acrylic acid. The side chains are highly anionic. These materials are anionic asphaltene like substances. Application is limited to high temperature wells they can soften and bond to the borehole walls. Like encapsulating polymers, they do not stop pore pressure penetration.