Polypac (Ul)

Polypac (UL)

FED PAC UL polyanionic cellulose (PAC) is a high-quality, water-soluble polymer designed to control fluid loss and, because it is an Ultra-Low (UL) additive, it causes a minimal increase in viscosity in water-base muds

Properties

• Physical appearance- White, free- flowing powder
• Specific gravity- 1.5-1.6
• pH (1% solution)- 6.5-8.0

Applications

FED PAC UL additive controls fluid loss in freshwater, seawater, KCl and salt water muds. It forms a thin, resilient, low-permeability filtercake which minimizes the potential for differential sticking and the invasion of filtrate and mud solids into permeable formations. FED PAC UL additive resists bacterial attack and does not require a biocide or preservative. It is effective in low concentrations, with the normal concentration to control fluid loss ranging from 0.25 to 1 lb/bbl (0.71 to 2.85 kg/m3). In saltwater and PAC-polymer systems, higher concentrations are required for encapsulation, with normal concentrations ranging from 1 to 3 lb/bbl (2.85 to 8.6 kg/m3).FED PAC UL polymer is an ultra-low additive which generates less viscosity than regular FED PAC R additive. The viscosity generated will depend on the solids concentrations, salinity and makeup water chemistry

FED PAC UL additive is an anionic polymer which will attach to, and encapsulate, exposed shales and drill cuttings. This protective polymer envelope inhibits the dispersion of shale cuttings and restricts fluid interactions with exposed shales In saturated salt systems, FED PAC UL agent tends to work significantly better than regular-viscosity PAC materials. For difficult filtration-control fluids, a combination of UL and regular-viscosity PAC products is generally more effective

Advantages

• Effective in low concentrations to control fluid loss
• Produces minimal viscosity increase
• Encapsulates shale particles to inhibit swelling and dispersion
• Resists bacterial attack; no biocide or preservative is necessary
• Functions over a wide range of salinity and hardness
• Effective over a wide range of pH levels
• Has application in all water-base muds, ranging from low-solids, non-dispersed polymer systems to high-density, dispersed systems; compatible with all common mud-treating additives
• Excellent environmental acceptability

Limitations

• Circulating temperature stability is approximately 300^OF (149^OC)
• Effective in systems with a total hardness of <1000 mg/L (as calcium), but can be precipitated in the combined presence of high hardness and high pH
  

Toxicity and Handling

• Bioassay information is available upon request
• Handle as an industrial chemical, wearing protective equipment and observing the precautions as described on the Material Safety Data Sheet (MSDS)

Packaging and Storage

• FED PAC UL additive is packaged in 50-lb (22.7-kg), multiwall, waterproof sacks.
• Store in a dry location away from sources of heat or ignition and minimize dust