Polyanionic Cellulose in Oil Drilling Fluid

Polyanionic cellulose (PAC) is a water-soluble polymer derived from cellulose, which is widely used in the oil and gas industry as a key component of drilling fluids. Here are some of the functions of PAC in oil drilling fluids:

1. Rheology control: PAC can be used as a rheology modifier in drilling fluids, controlling the viscosity and the flow properties of the fluid. It can reduce the viscosity of the fluid at low shear rates, making it easier to pump and circulate. It can also increase the viscosity at high shear rates, improving the suspension properties of the fluid.
2. Fluid loss control: PAC can be used as a fluid loss additive in drilling fluids, reducing the risk of fluid loss into the formation during drilling. It can form a thin and impermeable filter cake on the wellbore wall, preventing the invasion of formation fluids into the wellbore.
3. Shale inhibition: PAC can inhibit the swelling and dispersion of shale formations, preventing the destabilization of the drilling fluid and reducing the risk of wellbore instability.
4. Salt tolerance: PAC is tolerant to high salinity environments and can be used in drilling fluids containing high levels of salts and other contaminants.
5. Environmental compatibility: PAC is biodegradable and environmentally friendly, making it a safe and sustainable option for drilling fluids.

Overall, the functional properties of PAC make it a valuable ingredient in oil drilling fluids, enhancing their performance and improving their efficiency. PAC is commonly used in various drilling applications, such as water-based muds, brine-based muds, and completion fluids.