Polyanionic cellulose PAC is a polymer chemically modified from natural cellulose and has important applications in offshore oil drilling processes. Therefore, polyanionic cellulose (PAC) is often used in offshore oil drilling.

PAC's functions such as drilling fluid control, suspending agent, and rheology control in offshore oil drilling can help maintain the stability of the well wall, avoid collapse, and control the flow of drilling fluid.

PAC drilling fluid control generally uses thickeners and colloid protective agents to increase the viscosity of the drilling fluid and control the stability of the colloidal particles to achieve well wall stability and suspension of drill cuttings to prevent well wall collapse and damage.

In addition, PAC can increase the suspension capacity of drilling fluid, so that the drilling fluid can effectively suspend and transport drilling cuttings, prevent drilling cuttings from settling and wellbore clogging, and maintain the smooth operation of the drilling process.