Polyanionic Cellulose (PAC) is a high-purity, water-soluble modified cellulosic polymer. As a premium cellulose ether, PAC is specifically engineered for the most demanding water-based drilling fluid systems.
Compared to standard Carboxymethyl Cellulose (CMC), PAC features a higher degree of substitution and a more uniform distribution of substituent groups. This gives it superior resistance to temperature, salt, and microbial degradation. As a multifunctional drilling fluid additive, it serves primarily as a high-efficiency filtration reducer and viscosifier, making it an indispensable material in modern drilling operations.
We offer a complete range of PAC products, including high-viscosity, low-viscosity, and regular grades, to precisely match conditions from shallow water wells to ultra-deep oil and gas wells.
Grade / Series
Product Type
Key Features & Benefits
Core Applications
Compliance
UC-PAC-HV
High Viscosity PAC
Primary viscosifier and filtration reducer. Builds viscosity and carrying capacity quickly in low-solids or clear-water fluids.
Our PAC series serves as a high-performance, cost-effective alternative to brands like Drispac®, Polypac®, and Ultra Drill®.
Why Choose Unionchem PAC?
Superior Fluid Loss Control：
Forms a thin, tough, low-permeability filter cake on the borehole wall, effectively reducing filtration loss to protect reservoirs and improve hydrocarbon recovery.
Efficient Rheology Modification:
PAC HV significantly increases viscosity and suspension properties, while PAC LV controls fluid loss without an undesirable viscosity increase.
Excellent Stability:
Our high temperature stable PAC maintains performance in high-temperature, high-salt, and high-calcium environments.
High Purity & Eco-Friendly：
High-purity product means lower dosage and higher efficiency. It is a superior alternative to starch and its derivatives with less environmental impact.
Outstanding Alkaline Stability:
Compatible with most other drilling fluid additives and easily incorporated into any water-based drilling fluid system.
Key Application Areas
Oil & Gas Drilling:
● The core fluid loss control additive for all types of water-based drilling fluids. ● Delivers exceptional performance in deep well and high-temperature drilling, ensuring safe and efficient operations.
Completion & Workover Operations:
● As a completion fluids loss control additive, it minimizes formation damage to the pay zone. ● Provides stable fluid properties in workover fluids and fracture fluids. ● An ideal choice for drill-in fluids and polymer fluids.
Other Drilling Applications:
● HDD (Horizontal Directional Drilling) & Mining: Improves slurry carrying capacity and borehole stability. ● Waterwell Drilling & Minerals Exploration: Provides a cost-effective solution for fluid control.
Frequently Asked Questions (FAQ)
Q1: What is the main difference between PAC and CMC (Carboxymethyl Cellulose)?
A1: PAC is an upgraded version of CMC. PAC has a higher degree of substitution (DS) and more uniform substituent distribution, which gives it far superior performance in terms of temperature stability, salt tolerance, and shear resistance, especially in complex drilling environments.
Q2: How do I choose between PAC HV (High Viscosity) and PAC LV (Low Viscosity)?
A2: If your drilling fluid needs both viscosity and filtration control (e.g., in clear-water drilling), choose PAC HV. If your fluid is already viscous due to high solids content and you primarily need to control filtration, choose PAC LV to avoid excessive viscosity.
Q3: What are the benefits of using PAC in completion fluids?
A3: Using low-viscosity or ultra-low viscosity PAC during a completion operation effectively controls fluid loss into the formation without significantly increasing viscosity. This minimizes damage to the reservoir, protecting its natural productivity.
Contact Us Today for Your Drilling Fluid Solution!
Our Polyanionic Cellulose is manufactured under a strict ISO 9001 quality management system. All API-grade products meet or exceed the technical specifications of API 13A and ISO 13500. We are committed to delivering a high-performance drilling fluid additive with quality comparable to or exceeding premium brands like Platinum PAC® or Polypac Plus®.
Whether you need technical advice, test samples, or a competitive quote, our expert team is ready to assist you.
