Ramey & Schwaller wishes to congratulate its client CNPC USA on issuance of U.S. Patent Number 10,280,354 titled Polymer System for Fluid Loss Control on May 7, 2019. The patent relates to A combination of three polymers including a crosslinked acrylamide-TBAS copolymers in inverse emulsion form, N-vinyl pyrrolidone-acrylamide-TBAS terpolymer, and crosslinked N-vinyl pyrrolidone-acrylamide-TBAS acts as high temperature, high pressure fluid loss control additives for water-based drilling fluids systems.

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