Ramey & Schwaller wishes to congratulate its client CNPC-USA on issuance of U.S. Patent Number 9,909,050 titled HIGH DENSITY AND HIGH TEMPERATURE EMULSIFIER FOR USE IN AN OIL BASED DRILLING FLUID SYSTEM on March 6, 2018.  The patent relates to a drilling fluid system including an emulsifier that is stable under high density and high temperature conditions.  The present invention also relates to a method of manufacturing the emulsifier from a fatty oil, diethylenetriamine, and maleic acid.

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