PAC LV vs PAC HV in Drilling Fluids
PAC LV and PAC HV are both polyanionic cellulose grades, but they are selected for different balances of filtration control and viscosity contribution. The correct choice comes from the complete WBM target, not from the grade name alone.
Typically selected when filtration control is a priority and the mud programme needs a lower added-viscosity contribution.
Typically selected when the system also needs a stronger viscosity and carrying-capacity contribution.
Some fluid programmes use both functions, but dosage and grade should be selected from actual rheology, filtration and water chemistry.
Compare function before concentration
Evaluate target fluid loss, acceptable viscosity, low-shear carrying requirement, salinity, hardness, solids loading, temperature and the rest of the polymer package. Supplier dosage ranges are only starting points.
Mudolog PAC products
PACFILTER is the Mudolog PAC LV product positioned for filtration control with limited viscosity contribution. VISCOPAC is the PAC HV product positioned where viscosity, carrying capacity and filtration support are required together.
Related products and technical guides
Frequently Asked Questions
What is the main practical difference between PAC LV and PAC HV?
PAC LV is commonly selected when lower viscosity contribution is desired while controlling filtration; PAC HV is selected when stronger viscosity and carrying-capacity contribution is also required.
Can PAC LV and PAC HV be used together?
They can be combined in some mud designs, but the balance should be selected from measured rheology and filtration rather than from a fixed universal ratio.
Does salinity affect PAC selection?
Water chemistry is an important selection variable. Grade suitability and dosage should be confirmed in representative water and mud conditions.
Which Mudolog products correspond to PAC LV and PAC HV?
PACFILTER is the Mudolog PAC LV product and VISCOPAC is the Mudolog PAC HV product.