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Polyanionic Cellulose (PAC)

CAS No.: 9004-32-4

Molecular Formular: [C6H7O2(OH)2CH2COONa]n

Structural Formular:


PAC is a kind of nonionic cellulose ether featured the properties of high purity, high DS, particularly high viscosity or low viscosity. These products are demi-natural polymer additive, thickening agent, filtrate reducer.

PAC is an indispensable product for drilling mud making. It is high purity product; the water solution of this white powder is transparent and viscid. As water-soluble polymer, PAC dissolves immediately in cold/hot water and can be used as a thickening agent, rheology controller, bond, stabilizer, colloid protector, suspending agent, and filtrate reducer.

PAC is a good drilling mud additive and also an important material for confecting well liquid, a high mud volume product that featured high acid-resistance and salt-resistance ability. PAC is a good filtrate reducer with the capacity of increasing viscosity and anti-high temperature (150°C) in the freshwater, seawater, or even saturated brine well-completion liquid. PAC is suitable for confecting the completion fluid with these 3 kinds of water above.


Test Item Standard
Appearance Freely flowable powder Freely flowable powder
PH 6.0-8.0 6.0-8.0
Purity % ≥95% ≥95%
Moisture % ≤10% ≤10%
D.S. ≥0.90 ≥0.90
Viscosity Brookfield 1% ≤50 ≥1500
API Fluid Lose Increase 0.57% ≤25.0 ml ≤20.0ml
Increase 0.86% ≤15.0 ml ≤15.0ml
Increase 1.14% ≤10.0 ml ≤10.0ml
YP Value Increase 0.57% ≤0.5 ≥2.4
Increase 0.86% ≤1.0 ≥9.6
Increase 1.14% ≤1.5 ≥19.2

NOTE: The parameters can be adjusted as per requirements.


PAC-HV is for water-based drilling fluids, which can effectively reduces the filtration rate of many water-based oil and gas drilling fluids and may also be used to increase and stabilize viscosity to improve hole cleaning and suspension properties in a wide variety of fluid environment.

PAC-LV is for use in solids-laden, water-based drilling fluids, which can effectively reduces the filtration rate of many water-based drilling fluids, without causing significant increases in viscosity or gel strength.

PAC R is a cost-effective additive to reduce API filtration rate of many water based drilling fluids including freshwater, seawater, saturated saltwater and solids-free brines, native mud, flocculated mud, inhibited mud and contaminated systems. PAC R increases and stabilizes viscosity to improve rheology, wellhole cleaning and suspension property by coating and encapsulating cuttings and solids of drilling fluids. PAC R is effective over a wide range of pH environments. It lubricates solids in the system, improve wallcake characteristics and reduces the potential for stuck pipe.

Package and Storage:

Packed in multiply paper bags or fiber drums (25KG), or as per customer requirement; keep dry.


polyanionic cellulose, PAC, cellulose