Polyanionic Cellulose, commonly known as PAC, is a versatile water-soluble polymer derived from cellulose. It is a high-purity anionic polymer that finds extensive applications across various industries, including textiles, paper, food, pharmaceuticals, cosmetics, and particularly in the oil and gas sector.

In the demanding environment of oil and gas exploration and production, drilling fluids play a critical role in the success and safety of operations. These fluids, often referred to as drilling muds, perform multiple functions such as carrying cuttings to the surface, cooling and lubricating the drill bit, maintaining wellbore stability, and controlling formation pressure. A key challenge in water-based drilling fluids is controlling fluid loss into permeable formations and managing rheological properties to optimize performance.

This is where Polyanionic Cellulose excels. Available in different viscosity grades, primarily High Viscosity (PAC HV) and Low Viscosity (PAC LV), PAC is specifically designed to address these critical needs. Both grades function primarily as effective fluid loss control agents and rheology modifiers in water-based drilling muds.

PAC HV (High Viscosity Polyanionic Cellulose) is characterized by its higher molecular weight and chain length, resulting in a greater impact on fluid viscosity. It is particularly effective at increasing the overall viscosity of the drilling fluid, contributing to better suspension of drill cuttings and improved hole cleaning. Simultaneously, PAC HV forms a thin, impermeable filter cake on the wellbore wall, significantly reducing the amount of fluid that invades the surrounding formation. This controlled fluid loss is crucial for maintaining wellbore integrity and preventing formation damage or differential sticking.

PAC LV (Low Viscosity Polyanionic Cellulose), while having less impact on the overall viscosity compared to PAC HV, is an exceptionally efficient filter loss reducer. Its molecular structure is optimized to create a strong, flexible filter cake that minimizes fluid invasion, even in challenging conditions. PAC LV is often preferred when viscosity increase is not desired or when the primary focus is stringent fluid loss control with minimal alteration of the fluid's rheological profile. Both grades offer excellent compatibility with other common drilling fluid additives, making them easy to incorporate into complex mud formulations.

The benefits of using Polyanionic Cellulose in drilling fluids are numerous. Its ability to form a robust filter cake helps stabilize the wellbore, preventing shale hydration and collapse. Effective rheology modification ensures efficient transport of cuttings and prevents settling when circulation stops. PAC polymers are generally resistant to bacterial degradation and maintain their performance across a wide range of pH levels and temperatures encountered downhole. Their non-toxic nature is also an advantage from an environmental perspective.

Typical specifications for Polyanionic Cellulose grades used in drilling applications include parameters such as appearance (usually a white to off-white powder or granular material), moisture content, purity level (often measured by active content), viscosity (measured in standard units like mPa·s under defined conditions), and API filter loss (measured in milliliters, representing the volume of filtrate passing through a standard filter medium). High-quality PAC boasts low moisture, high purity, and performance parameters that meet or exceed industry standards, ensuring consistent and reliable results in demanding drilling operations.

The manufacturing process for Polyanionic Cellulose involves the chemical modification of natural cellulose. This process typically includes the alkalization of cellulose followed by etherification with sodium monochloroacetate. The reaction conditions, including temperature, time, and reactant concentrations, are carefully controlled to achieve the desired degree of substitution and molecular weight, which in turn determine the viscosity grade and performance characteristics of the final product, whether it is PAC HV or PAC LV.

Packaging options for Polyanionic Cellulose typically include multi-layer paper bags or composite kraft paper bags, commonly in 25kg sizes. Larger packaging like IBC tanks may also be available depending on volume and customer requirements. Proper storage is essential to maintain product quality. PAC should be stored in a cool, dry, well-ventilated area, away from direct sunlight, moisture, and potential sources of ignition. When stored under appropriate conditions, the product typically has a stable shelf life of at least 24 months.

As a crucial additive in modern drilling fluid technology, Polyanionic Cellulose PAC HV and LV provide operators with the tools to optimize fluid performance, enhance wellbore stability, and improve overall drilling efficiency and safety. Finding a reliable supplier and manufacturer of high-quality PAC products is essential for ensuring consistent performance in the field. Factors influencing the price include purity, viscosity grade, order volume, and packaging. Detailed information on how to buy or purchase specific grades, including minimum order quantities and price per kilogram, can be obtained upon inquiry. Companies seeking to purchase bulk quantities should discuss their technical requirements to ensure the chosen PAC grade is best suited for their specific drilling applications.

For those looking to acquire high-performance Polyanionic Cellulose PAC HV or PAC LV powder, connecting with a reputable manufacturer or supplier is the first step. Understanding the required specifications and potential volume needed will help determine the most competitive price for your procurement needs. Inquire about samples or trial orders to evaluate product quality firsthand before committing to a large purchase.