PAC-STAR DHV
PAC-STAR DHV polyanionic cellulose is a high-quality, readily dispersible water-soluble polymer designed to control fluid loss and increase viscosity in water-base muds.
Application
PAC-STAR DHV controls fluid loss and provides viscosity in freshwater and seawater drilling fluid system. PAC-STAR DHV forms a thin, resilient, low- permeability filter cake minimizing the potential for formation sloughing and the invasion of filtrate and mud solids into permeable formations.
Advantages
- Readily mixing and effective in low concentrations for controlling fluid loss and building viscosity
- Encapsulates shale particles to inhibit swelling and dispersion
- Resists bacterial attack, requiring no biocides or preservatives
- Functions over a wide range of salinity, hardness and pH levels
- Applicable in all water-base fluids, ranging from low-solids, non-dispersed polymer systems to high-density, dispersed systems
Typical Usages
| Typical Amounts of PAC-STAR DHV Added to freshwater | ||
|---|---|---|
| Drilling Application | lb/bbl | kg/m³ |
| Normal fluid-loss | 0.25 - 1 | 0.7 - 2.85 |
| PAC-STAR DHV is effective in low concentrations and should be added directly to hopper or feeder | ||
| PAC-STAR DHV does not clump or form -fish eyes- | ||
Typical Properties
| Physical Appearance | Beige, free-flowing granules |
|---|---|
| Specific Gravity | 1.5 -1.6 |
| pH (1% solution) | 6.5 - 8.0 |
Packaging
PAC-STAR DHV is packaged in 50-lb (22.7kg) multi-wall bags