ALEXANDRIA, Va., June 16 -- United States Patent no. 12,305,117, issued on May 20, was assigned to LLC OILMIND (Moscow).
"Method for leveling the injectivity profile of an injection well" was invented by Vitalii Vyacheslavovich Sergeev (Moscow).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for leveling the injectivity profile of an injection well involves pumping into the bottom-hole formation zone a blocking agent in the form of an emulsion system containing nanoparticles of silicon dioxide and being comprised of: 5-12 vol % diesel fuel, 2-3 vol % emulsifier, 0.25-1.0 vol % colloidal nanoparticles of silicon dioxide, with the remainder being an aqueous solution of calcium chloride or potassium chlo...