Polyanionic Cellulose PAC-L (Filtration Control)
CAS Number: 9004-32-4
Polyanionic Cellulose PAC-L is a low-viscosity grade carboxymethyl cellulose derivative specifically engineered for filtration control (fluid loss reduction) in water-based drilling fluids, compliant with API Spec 13A. At dose rates of 0.5–3 kg/m³, it forms a thin, low-permeability filter cake on the borehole wall that controls HPHT fluid loss to <20 mL at 150°C/500 psi. Its ionic character and thermal stability make it effective in freshwater, seawater, and saturated-salt muds.
Technical Specifications
| grade | PAC-L (low viscosity) |
| moisture content | ≤10% |
| API 13A compliance | Yes — Section 10 |
| HPHT fluid loss 150C | <20 mL |
Applications
- Filtration control in water-based drilling fluids
- HPHT wellbore fluid loss reduction
- Seawater and saturated-salt drilling mud treatment
- Workover and completion fluid filtration control
- Horizontal and directional well drilling
Key Features
- Polyanionic Cellulose PAC-L meets API Spec 13A Section 10 for filtration control applications in drilling fluids
- Effective at 0.5–3 kg/m³ in freshwater, seawater, and saturated NaCl/KCl muds
- Low-viscosity grade minimizes viscosity increase while maximizing filter cake quality
- Thermal stability to 150°C makes it suitable for deep and high-temperature wells
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