Polyanionic cellulose (PAC) is a water-soluble cellulose ether derivative, which is widely used in drilling fluid treatment, especially drilling fluid for salt water wells.

In brine well drilling fluid, PAC can be used as an additive to improve the salt resistance and temperature resistance of drilling fluid, maintain and improve the performance of drilling fluid, reduce fluid loss and frictional resistance, and effectively transmit pressure.

In addition, PAC also has the characteristics of anti-salt, anti-calcium, anti-alkali, etc., which can effectively solve the complicated situations in the drilling process and improve drilling efficiency.