... systems. It provides cuttings encapsulation, shale filming/inhibition, flocculation of drilled solids, viscosity and lubricity. PHPA's strong encapsulating/ ... clay and shale formations, blocks the absorption or inhibition of water from the drilling fluids, prevents clay and shale ... RESERVATION RATE, %96.07MOLECULAR WEIGHT THOUSAND12,308DISSOLVING TIME55 MINUTES9DEGREE OF HYDROLYSIS, %31 PHPA(PAM)