US Patent Issued to CNPC USA, Beijing Huamei, China National Petroleum on Aug. 19 for "Method for making nano- and micro-particles for use as a proppant and fluid-loss-control additive" (Chinese, American Inventors)

ALEXANDRIA, Va., Aug. 20 -- United States Patent no. 12,391,868, issued on Aug. 19, was assigned to CNPC USA Corp. (Houston), Beijing Huamei Inc. (Beijing) and China National Petroleum Corp. (Beijing).

"Method for making nano- and micro-particles for use as a proppant and fluid-loss-control additive" was invented by Lijun Lin (Katy, Texas), Jiangshui Huang (Sugar Land, Texas), Fuchen Liu (Panjin, China), Lulu Song (Houston), Zhenzhou Yang (Beijing), Yu Liu (Beijing) and Hanxiao Wang (Beijing).

According to the abstract* released by the U.S. Patent & Trademark Office: "Nano- and micro-particles (NMP) can be formed from an oil/water emulsion. The emulsion is made by mixing a liquid solvent, at least one surfactant, a particle-forming compou...