Ramey & Schwaller wishes to congratulate its client CNPC-USA on issuance of U.S. Patent Number 10,072,197 B2 titled CROSSLINKED HIGH MOLECULAR WEIGHT POLYMERS FOR USE IN WATER-BASED DRILLING FLUIDS on September 11, 2018.  The patent relates to Crosslinked high molecular weight acrylamide and 2-acry­lamido-2-methylpropane sulfonic acid copolymers in inverse emulsion form act as inhibitive and encapsulating agents for water-based drilling fluids system.

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