Brochure HDD, Mining & Waterwell
Product listing and applications.
POLYPAC UL ultralow-viscosity polyanionic cellulose (PAC) is a high-quality, water-soluble polymer designed to control fluid loss. Because it is an ultra-low additive, it causes a minimal increase in viscosity in water-based muds.
|Typical Physical Properties|
|Physical appearance||White, free-flowing powder|
|pH (1% solution)||6.5–8.0|
POLYPAC UL additive controls fluid loss in freshwater, seawater, KCl and salt muds. It forms a thin, resilient, low-permeability filter cake which minimizes the potential for differential sticking and the invasion of filtrate and mud solids into permeable formations. POLYPAC 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 lbm/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 lbm/bbl [2.85 to 8.6 kg/m3].
POLYPAC UL additive is an ultra-low additive, which generates less viscosity than regular POLYPAC additive. The viscosity generated depends on the solids concentration, salinity and makeup water chemistry.
POLYPAC UL additive is an anionic polymer that attaches to and encapsulates 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, POLYPAC UL additive 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.
Bioassay information is available upon request. Handle as an industrial chemical, wearing protective equipment and observing the precautions described in the safety data sheet.
POLYPAC UL additive is packaged in 50-lbm [22.7-kg] multiwall waterproof sacks. Store in a dry, well-ventilated area. Keep container closed. Store away from incompatibles. Follow safe warehousing practices regarding palletizing, banding, shrink-wrapping, and stacking.
The Offshore Black Sea area is well known for drilling difficulties like wellbore instability, bit balling and tight hole while tripping, caused by the highly reactive shale formation.