A cationic polymeric alcohol anti-sloughing agent YPVA with well anti-sloughing function and lower side effect of increasing viscosity was developed through modifying the polymeric alcohol (PVA). Degrade PVA firstly, then make the degraded PVA have action groups. It was proved that the modified PVA has ortho-nitrogen radicals by molecular structure analysis through infrared spectrum. Then the anti-sloughing mechanisms of YPVA were investigated deeply through experiments such as rolling and dispersing recovery, zeta potential and particle size distribution measuring, adsorption and pressure transmission. The anti-sloughing mechanisms are mainly as follows: prevent mud shale particles to hydrate and disperse by adsorbing and coating; holdback mud shale particles to hydrate through altering their surface charge and compressing their diffused double layer after adsorbing on them; pressure and block filtrate transfer through forming film and covering on the surface of slits and pores after adsorbing on the surface of rock in the stratum.
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