Polyanionic Cellulose Regular (PAC-R) for Drilling Fluids
CAS Number: 9004-32-4
PAC-R (Polyanionic Cellulose, Regular grade) is a cellulose-derived fluid loss control agent and viscosifier used in water-based drilling fluids. It effectively reduces filtration loss and builds moderate viscosity in both freshwater and salt-saturated (NaCl, KCl, CaCl₂) mud systems. PAC-R forms a thin, low-permeability filter cake on the borehole wall to prevent formation fluid influx and protect productive formations.
Technical Specifications
| appearance | White to off-white free-flowing powder |
| moisture content (%) | ≤10 |
| degree of substitution (DS) | 0.85–0.95 |
| API filtrate reduction vs. base mud (%) | ≥70 |
| viscosity of 2% solution (mPa·s, 25°C) | ≥30 |
Applications
- Water-based drilling fluid filtration control
- Salt mud fluid loss reduction
- Borehole wall filter cake formation
- Completion fluid filtration control
- Workover and packer fluid viscosity
Key Features
- Excellent fluid loss control in fresh, saline, and saturated brine muds
- Forms thin, low-permeability filter cake for wellbore protection
- Salt-tolerant up to NaCl saturation
- Biodegradable and low-toxicity for environmentally sensitive areas
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