Ramey & Schwaller wishes to congratulate its client CNPC USA CORPORATION on issuance of US Patent # 10,907,083 titled POLYMER SYSTEM FOR FLUID LOSS CONTROL on February 2, 2021.  The patent is based on 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. The combination is particularly useful for high salt, high density drilling fluids, and high temperature applications.

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