Polyacrylamide as coating agent contains many functional groups. It can optimize mud performance by adjusting molecular structure. It has excellent inhibition, filtration loss reduction, lubricity, high temperature resistance, calcium and magnesium resistance, high salt resistance and other comprehensive properties. It can reduce the damage to reservoir permeability and has stable chemical performance. It is suitable for water-based and oil-based drilling mud systems.

Application:(1)coating drilling cuttings,inhibiting dispersion, so as to control solid content;(2）inhibiting shale hydration expansion, stabilizing well wall,inhibiting shrinkage and dispersion collapse;(3)inhibiting clay component expansion in oil gas reservoir;(4)reducing damage to permeability of oil and gas reservoir.(5)lubricate the bit to reduce the wear of the equipment;(6)improve the drilling speed and shorten the well construction period.