PAC R Effective in control fluid loss Resists attack from bacteria, requiring no preservatives or bactericide all ph range
PAC R 75
Polyanionic cellulose is a fluid loss and viscosity control additive. PAC R 75 agent
is a regular tech grade quality PAC, useful in controlling filtration and increasing rheology in all types of water, but is particularly effective in saltwater brines. PAC R 75 additive will aid in dispersion control by attaching and encapsulating the drill solids. It may be used at all density ranges, and functions effectively in dispersed and non dispersed systems.
Typical Physical Properties
| Physical appearance | White powder |
| Specific gravity | 1.5 to 1.6 |
| pH | 6.5 to 8.0 (1% solution) |
Applications
PAC R 75 additive controls fluid loss in freshwater, seawater, KCl, and saltwater
drilling fluid systems. It aids in the formation of a tough, thin filtercake to minimize the
potential for differential sticking. Recommended treatment is from 0.5 to 3.0 lb/bbl (1.5
to 9.0 kg/m3) depending on the water type and the salt level for the control of fluid loss.
PAC R 75 agent is useful in viscosifying all types of water to create sufficient
yield point to assist in the carrying capacity of solids for improved whole cleaning.
Typically PAC R 75 additive provides a 15 cP viscosity and 30lb/100 ft2 (14.3Pa)
yield point with a concentration of 2.5 lb/bbl (7.0 kg/m3) in freshwater without any clay.
Recommended concentrations for building viscosity range from 1.0 to 4.0 lb/bbl (3.0 to
12.0 kg/m3).
Water hardness and salt level will affect the amount of PAC R 75 additive
required.
PAC R 75 product will create an envelope around exposed shales and cuttings to
encapsulate them, reducing dispersion and permitting improvement of wellbore integrity.
The encapsulation protects the shale from exposure to water.
Advantages
Ø Effective in controlling fluid loss
Ø Resists attack from bacteria, requiring no preservatives or bactericide
Ø Environmentally acceptable
Ø Depending on water quality, provides viscosity
Ø Functions at all ranges of pH levels in both dispersed and non dispersed fluids
Limitations
ØContains salt as a byproduct of processing
ØHigh hardness (1,000 mg/L) will require precipitation of the Ca++ and Mg++ to
improve performance
ØTemperature stability limitation of 250°F (120°C); approaching this temperature, a
thermal stabilizer, such as PTS 200* additive, will be required
Ø Has lower D.S. than PAC R 85 product
Toxicity and Handling
Bioassay information is available upon request. Handle as an industrial chemical,
wearing protective equipment and observing the precautions as described on the Material
Safety Data Sheet (MSDS).
Packaging and Storage
PAC R 75 additive is packaged in 50lb (22.7kg), multiwall, paper sacks.
Store in a dry location away from sources of heat or ignition, and minimize dust.
Poly Anionic Cellulose PAC R 75%
