High viscosity polyanionic cellulose (HV-PAC) is a high-quality drilling fluid additive with a high degree of substitution and good fluid loss reduction performance, and is widely used in drilling operations.

First, HV-PAC has high viscosity, which can significantly improve the viscosity and rock-carrying ability of drilling fluid. This helps to reduce the settling of cuttings and improve drilling efficiency. In addition, high viscosity also helps to enhance the suspension ability of the drilling fluid and ensure effective contact between the drill bit and the well wall, thereby reducing the occurrence of accidents such as well wall collapse and drill sticking.

Secondly, HV-PAC has excellent filter loss reduction performance. It can effectively reduce the water loss of drilling fluid and maintain the stability and rheology of drilling fluid. This helps maintain the performance of the drilling fluid and prevents damage to the drilling fluid system due to excessive water loss. The excellent properties of fluid loss control additives help maintain the integrity of drilling fluids, making them stable at high temperatures and pressures.

Furthermore, HV-PAC has a high degree of substitution. This means it has more reactive groups in its molecular structure and is better compatible with other additives in drilling fluids. This helps to improve the stability and anti-pollution ability of the drilling fluid, so that it can still maintain excellent performance in the face of various complex environmental conditions.

In addition, HV-PAC has good temperature resistance and salt resistance. At high temperatures and in salt water, it maintains stable performance regardless of changes in temperature and salinity. This makes HV-PAC have wide application value in various geological conditions.

Finally, HV-PACs are environmentally friendly. As a natural cellulose ether derivative, it is more environmentally friendly than traditional chemical mud additives. This helps to reduce environmental and ecological pollution, and promotes the sustainable development of the oil drilling industry.

In short, HV-PAC is a high-quality drilling fluid additive with the advantages of high viscosity, good fluid loss reduction performance, high degree of substitution, temperature resistance and salt resistance, and environmental protection. During the drilling process, the use of HV-PAC can effectively improve drilling efficiency, reduce the incidence of accidents, and have a better protective effect on the environment and ecology. Therefore, HV-PAC has broad application prospects in future oil drilling operations.