ALEXANDRIA, Va., March 26 -- United States Patent no. 12,258,822, issued on March 25.
"Encapsulated lost circulation materials based on swellable elastomers" was invented by Rostyslav Dolog (Houston), Qusai A. Darugar (Houston), Radhika Suresh (Sugar Land, Texas) and Oleg Mazyar (Katy, Texas).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method of reducing lost circulation includes introducing into a subsurface formation a wellbore fluid containing an encapsulated lost circulation material having a core including an elastomer and a disintegrating agent, and the disintegrating agent including at least one of the phase change material or a gas-producing material, and a shell encapsulating the core; heating t...