PAC HV & PAC LV

PAC, short for polyanionic cellulose, is a cellulose derivative most commonly used as an additive in oil drilling fluids. Based on their viscosity, PAC is categorized into two types: PAC LV (Low Viscosity) and PAC HV (High Viscosity).

The following is a comparison chart of the core differences between PAC LV (low viscosity polyanionic cellulose) and PAC HV (high viscosity polyanionic cellulose) , based on their functions, physicochemical properties, and application scenarios in drilling fluids:

characteristic	PAC LV (Low Viscosity )	PAC HV (High Viscosity )
Viscosity performance	Low viscosity (apparent viscosity ≤ 40 mPa·s) focuses on reducing fluid loss and has little effect on slurry thickening.	High viscosity (apparent viscosity ≥50 mPa·s) with dual functions of viscosity increase and fluid loss reduction
Core Features	▶ Highly efficient fluid loss reduction (API fluid loss ≤ 16 mL) ▶ Improved mud cake quality ▶ Salt and calcium resistance	▶ Highly efficient fluid loss reduction (API fluid loss ≤ 23ml) ▶ Significantly increases viscosity and shear strength ▶ Powerfully reduces fluid loss ▶ Suspends cuttings and cleans wellbore
Salt and calcium resistance	⭐⭐⭐⭐ (Stronger stability in high concentration salt water/calcium contamination)	⭐⭐⭐ (slightly weaker in salt resistance, but still stable at high temperatures)
Applicable drilling fluid system	▶ Brine/saturated brine system ▶ High-density drilling fluid ▶ Scenario requiring low viscosity and high shear	▶ Freshwater/low salinity systems ▶ Shallow wells requiring high viscosity ▶ Well sections where cuttings carrying is difficult
Recommended dosage range	0.3%–1.0% (low addition amount to achieve high efficiency in fluid loss reduction)	0.5%–1.5% (a higher dosage is required to ensure viscosity-increasing effect)
Applicable temperature range	≤150°C (stable performance at high temperature)	≤150°C (viscosity may decrease at high temperatures)
Molecular structure characteristics	Short chain molecules, high degree of substitution (>0.90), rapid dispersion and dissolution	Long chain molecules, degree of substitution ≥0.90 need to be stirred and dissolved moderately
Economical	★★★★☆ (Low dosage + strong anti-pollution → low overall cost)	★★★☆☆ (Usage is relatively high; other treatment agents are required for deep wells)

Popular Products

Send Inquiry