ALEXANDRIA, Va., July 15 -- United States Patent no. 12,662,926, issued on June 23, was assigned to Halliburton Energy Services Inc. (Houston).

"Detection of fluid losses or gains in managed pressure drilling operations" was invented by Yan Luo (Carrollton, Texas) and Muran Han (Singapore).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed embodiments relate to MPD well drilling methods, for example detecting fluid gains or losses even in transient conditions. For example, data relating to one or more parameter of the drilling system may be corrected/filtered using one or more technique. The corrected data can be used to calculate flowrate difference (DeltaFR), and possible fluid losses or gains in the ...