Why is PAC used in oil drilling?
2026-04-14 09:54:24
PAC(Polyanionic Cellulose)is widely used in oil and gas drilling mainly because of its outstanding stability and functional performance under harsh downhole conditions,which ordinary additives cannot match.
Excellent fluid loss control
PAC forms a thin,compact,and tough filter cake on the wellbore,effectively reducing water loss from drilling mud,protecting the formation,and preventing reservoir damage.
Strong salt and calcium resistance
It maintains stable performance in freshwater,saltwater,seawater,and high-hardness environments,without precipitation or viscosity loss,making it ideal for offshore and salt formation drilling.
Good thermal stability
PAC retains effective rheological and filtration control at medium to high temperatures,suitable for deep wells,high-temperature wells,and complex drilling operations.
Stable rheology and suspension ability
It stabilizes the viscosity and shear force of drilling fluids,ensuring efficient carrying and suspension of drill cuttings and weighting materials,avoiding settlement and blockage.
Wellbore stability and anti‑sticking performance
High-quality filter cake reduces friction and helps prevent differential sticking and wellbore collapse.
Wide compatibility
PAC works well with bentonite,polymers,lubricants,and other additives,making it suitable for most water-based drilling fluid systems.
In summary,PAC is a core treatment agent for modern drilling fluids,especially in high-temperature,high-salinity,and complex geological environments.
References
GB/T 7714
Zhao K,Liu Y,He W.Application advantages of polyanionic cellulose in oilfield drilling fluids[J].Chemical Industry,2020,38(5):45–49.
MLA
Zhao,Kun,et al."Application Advantages of Polyanionic Cellulose in Oilfield Drilling Fluids."Chemical Industry,vol.38,no.5,2020,pp.45–49.
APA
Zhao,K.,Liu,Y.,&He,W.(2020).Application advantages of polyanionic cellulose in oilfield drilling fluids.Chemical Industry,38(5),45–49.
