Introduction

During deep well drilling, due to the high temperature of the deep down hole, the viscosity  of the drilling fluid increases and the rheological properties decrease, and the viscosity reducer  can disperse the clay particles or block its network structure, so as to reduce the viscosity of the  drilling fluid and improve the rheological properties of the fluid itself. It is suitable for light cement slurry, sea cement slurry, salt cement slurry and deep well  water-based mud system.