PAC-LV, PAC-Hv, PAC R, Oil Drilling Material

Polyanionic cellulose (PAC) is commonly categorized into different grades based on its molecular weight, degree of substitution, and other properties. Here’s a breakdown of some common types of PAC used in the oil drilling industry:

1. PAC-LV (Low Viscosity):
   • PAC-LV is a low viscosity grade of polyanionic cellulose used in water-based drilling fluids.
   • It is characterized by its relatively lower viscosity compared to other PAC grades.
   • PAC-LV is typically used when moderate viscosity control and fluid loss control are required in drilling operations.
2. PAC-HV (High Viscosity):
   • PAC-HV is a high viscosity grade of polyanionic cellulose used for achieving higher viscosity in water-based drilling fluids.
   • It provides excellent rheological properties and fluid loss control, making it suitable for challenging drilling conditions where increased suspension of solids is needed.
3. PAC R (Regular):
   • PAC R, or regular-grade PAC, is a mid-range viscosity grade of polyanionic cellulose.
   • It offers balanced viscosifying and fluid loss control properties, making it suitable for a wide range of drilling applications where moderate viscosity and fluid loss control are required.

These different grades of PAC are used in oil drilling fluids to achieve specific viscosity, rheology, and fluid loss control targets based on the drilling conditions, formation characteristics, and wellbore stability requirements.

In oil drilling operations, PAC is used as an essential additive in water-based drilling fluids to:

• Control viscosity and rheology to optimize drilling performance and prevent wellbore instability.
• Minimize fluid loss into the formation, reducing formation damage and improving well productivity.
• Suspend drilled cuttings and solids, facilitating their removal from the wellbore.
• Provide lubrication and reduce friction between the drill string and the wellbore wall.

Overall, PAC plays a critical role as a viscosifier and fluid loss control agent in water-based drilling fluids, contributing to efficient and successful drilling operations in the oil and gas industry.