Polyanionic cellulose (PAC)

Polyanionic Cellulose (PAC) is a high-quality polymer derived from cellulose, which has been chemically modified to introduce anionic groups. This modification enhances its solubility and performance in various applications, particularly in drilling fluids.
PAC is divided into two types: high viscosity (HV) and low viscosity (LV), which can be used as thickener, rheology control agent, adhesive, stabilizer, protective colloid, suspending agent and water retention agent.
 
In the oil mining industry, PAC is a better drilling mud treatment agent and material for preparing completion fluids, with high slurry production rate and good salt and calcium resistance. For light cement slurry, sea cement slurry and saturated salt cement slurry, PAC is a very good fluid loss treatment agent, and has a good viscosity lifting ability and high temperature resistance (150 ℃) ability.
 
It is suitable for preparing freshwater, seawater and saturated brine completion fluids, and can be prepared into various density completion fluids under the weight of calcium chloride, and can make the completion fluids have a certain viscosity and a low fluid loss.
 
The high-viscosity and low-viscosity PACs produced by our company comply with European OCMA standards and American API standards.
Specifications: High viscosity (HV) and low viscosity (LV)
 

Polyanionic cellulose (PAC) Specification

Grade
PAC-HV-1
PAC-HV-2
PAC-LV-1
PAC-LV-2
Degree of substitution（D.S）
≥0.85
≥0.9
≥0.95
≥0.95
Viscosity(2%solution,NDJ-79,25℃)
≥1600mPa.s
≥1600mPa.s
50~100mPa.s
80~100mPa.s
Moisture
≤10%
≤9%
≤10%
≤10%
pH
6.5 ~ 8.5
6.5 ~ 8.5
6.0 ~ 8.5
6.0 ~ 8.5
造浆率(θ600转读数):
0.88克样品在350ml去离子水
1.33克样品在350ml 4%NaCl
1.0克样品在350ml饱和NaCl
 
 
≥30
≥30
≥30
 
 
 
 
 
流变性能:
2.0克样品在350ml海水
3.0克样品在350ml海水
4.0克样品在350ml海水
 
YP≥5
YP≥20
YP≥40
 
 
YP≤1
YP≤1
YP≤1
 
API 失水:
2.0克样品在350ml海水
3.0克样品在350ml海水
4.0克样品在350ml海水
 
≤20ml
≤15ml
≤10ml
 
 
≤20ml
≤15ml
≤10ml
 
API 失水:
0.75克样品在海水中
 
 
≤26ml
 
 
 
流变性能:
2.5克样品在350ml去离子水中
2.5克样品在350ml饱和NaCl
 
 
 
 
PV<18  YP<18
PV<8   YP<8
API 失水:
0.5克样品在350ml去离子水
1.0克样品在350ml海水/氯化钾
 
 
 
 
≤10ml
≤24ml

Applications

PAC is widely used in the oil and gas industry, particularly in drilling fluids, due to its ability to control filtration and increase rheology. It is also used in other applications where thickening, stabilizing, and suspending properties are required.

Performance Characteristics

  • Filtration Control: Effectively reduces the filtration rate of drilling fluids, helping to maintain wellbore stability and reduce fluid loss.
  • Viscosity Increase: Enhances the viscosity of drilling fluids, improving their ability to carry cuttings and maintain wellbore integrity.
  • Rheology: Improves the rheological properties of drilling fluids, ensuring better flow characteristics and hole cleaning efficiency.

Handling and Storage

  • Storage Conditions: Store in a cool, dry place away from direct sunlight. The product should be kept in its original packaging until use to prevent contamination.
  • Shelf Life: 24 months under recommended storage conditions.

Safety Information

  • Handling Precautions: Avoid inhalation of dust. Use appropriate personal protective equipment (PPE) such as gloves and goggles when handling the product.
  • Environmental Precautions: Dispose of the product in accordance with local regulations. Avoid release into the environment.