US Patent Issued to Saudi Arabian Oil on Aug. 25 for "Methods for isolating a lost circulation zone in a carbonate subsurface formation" (Saudi Arabia, American Inventors)

ALEXANDRIA, Va., Aug. 25 -- United States Patent no. 12,716,304, issued on Aug. 25, was assigned to Saudi Arabian Oil Co. (Dhahran, Saudi Arabia).

"Methods for isolating a lost circulation zone in a carbonate subsurface formation" was invented by Joseph M. Shine Jr. (Houston) and Maysa S. Al-Ahmadi (Dhahran, Saudi Arabia).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method of isolating a lost circulation zone in a carbonate subsurface formation comprising pumping a reactive pad fluid into the lost circulation zone, wherein the reactive pad fluid comprises a first aqueous solution, calcium chloride, and sodium montmorillonite; pumping a cement slurry comprising a second aqueous solution and Portland cement...