US Patent Issued to Halliburton Energy Services on July 14 for "Fluid loss control additives for drilling fluids" (Texas Inventors)

ALEXANDRIA, Va., July 14 -- United States Patent no. 12,680,400, issued on July 14, was assigned to Halliburton Energy Services Inc. (Houston).

"Fluid loss control additives for drilling fluids" was invented by Hui Zhou (Houston), Jay Deville (Houston) and Preston Andrew May (Houston).

According to the abstract* released by the U.S. Patent & Trademark Office: "Drilling fluids for drilling a wellbore. An example drilling fluid includes an aqueous base fluid, a first fluid loss control additive that is a cross-linked polymer comprising N-vinylpyrrolidone as a monomer, and a second fluid loss control additive that is a cross-linked copolymer comprising a first comonomer of 2-acrylamido-2-methylpropanesulfonic acid in a first comonomer concen...