What Is The Difference Between PAC LV And PAC HV in The Oil Drilling Industry?

Characteristic

PAC LV (Low Viscosity )

PAC HV (High Viscosity )

‌Core Features‌

▶ Highly efficient fluid loss reduction (API fluid loss ≤ 1 6 mL)
▶ Improved mud cake quality
▶ Salt and calcium resistance

▶ Significantly increases viscosity and shear strength
▶ Powerfully reduces fluid loss
▶ Suspends cuttings and cleans wellbore

Viscosity performance

Low viscosity (apparent viscosity ≤ 40 mPa·s)
focuses on reducing fluid loss and has a weak effect on slurry thickening

High viscosity , significant thickening (apparent viscosity ≥ 50 mPa·s)
with dual functions of viscosity increase and fluid loss reduction

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

▶ Deep wells, high temperature and high salt wells

▶ Freshwater/low salinity systems
▶ Shallow wells requiring high viscosity
▶ Well sections where cuttings carrying is difficult

▶ Extended reach wells and complex wellbores require high rock carrying capacity and wellbore stability

Applicable temperature range

≤150°C (stable performance at high temperature)

≤140°C (viscosity may decrease at high temperatures)

Molecular structure characteristics

Short chain molecules, high degree of substitution (>0.9 0 )
, rapid dispersion and dissolution

Long chain molecules, high 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)

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)