... high dissolution velocity* Stabilizes borehole, reduces torque, improves quality of mud cake* Passes solid equipment smoothly, high efficiency, economical* Easy ... control fluid loss of drilling fluid, improve quality of mud cake, and be used for salt water and saturated ... % ≥30Apparent viscosity of 1% aqueous solution, mPa.s ≥20At room temperature, API filtration , mL ≤10API filtration (320F/160°C, 16 ...