ALEXANDRIA, Va., July 16 -- United States Patent no. 12,669,268, issued on June 30, was assigned to Schlumberger Technology Corp. (Sugar Land, Texas).
"Closed well loop for a geothermal system" was invented by Ashley Bernard Johnson (Cambridge, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "A closed well loop is provided for a geothermal system. The closed well loop includes a well (single well) that traverses a subterranean formation to extract heat from the subterranean formation. The well includes a section having an inner pipe that is supported inside an outer pipe in a pipe-in-pipe arrangement. The inner pipe has an interior flow channel that defines a first flow path for circulating worki...