What is Polyanionic Cellulose used for in drilling fluids?

Polyanionic Cellulose(PAC)is a high-performance additive widely used in water-based drilling fluids,especially for high-temperature,high-salt,and deep well operations.Its main functions are as follows:

Fluid Loss Control

PAC forms a thin,dense,and tough filter cake on the wellbore,effectively reducing water loss from drilling fluid into formations,preventing reservoir damage and wellbore collapse.

Rheology Regulation&Suspension

It stabilizes the viscosity and shear force of drilling mud,improving its ability to suspend drill cuttings and weighting materials,avoiding sedimentation and ensuring smooth circulation.

Salt&Calcium Resistance

PAC maintains stable performance in freshwater,saltwater,seawater,and high-hardness environments,resisting electrolyte contamination that would cause failure of conventional additives.

Thermal Stability

It retains good thickening and filtration control under medium to high temperatures,making it suitable for deep wells,directional wells,and complex geological drilling.

Wellbore Stabilization

By improving filter cake quality and mud stability,PAC helps prevent differential sticking,borehole sloughing,and fluid invasion.

Good Compatibility

It is compatible with bentonite,polymers,lubricants,and other drilling fluid additives,suitable for various water-based mud systems.

References

GB/T 7714

Chen W,Hu J,Yang Y.Application of polyanionic cellulose in drilling fluid treatment[J].Drilling Fluid&Completion Fluid,2022,39(1):1–6.

MLA

Chen,Wei,et al."Application of Polyanionic Cellulose in Drilling Fluid Treatment."Drilling Fluid&Completion Fluid,vol.39,no.1,2022,pp.1–6.

APA

Chen,W.,Hu,J.,&Yang,Y.(2022).Application of polyanionic cellulose in drilling fluid treatment.Drilling Fluid&Completion Fluid,39(1),1–6.