... Xanthan Gum, XC polymer, XCD polymer Drilling, workover or completion fluids viscosifying additive Chemical ... to all fresh-water, salt water and gyp drilling fluids, the product has a high resistance to ... .Xanthan Gum increases the viscosity of the drilling fluid at low shear rates, thus increasing the ... shear rates, which occur at the bit, the drilling fluid treated with XC-polymer is low-viscous, thus ...