ALEXANDRIA, Va., Feb. 26 -- United States Patent no. 12,234,719, issued on Feb. 25, was assigned to SCHLUMBERGER TECHNOLOGY Corp. (Sugar Land, Texas).

"Methods for determining a position of a droppable object in a wellbore" was invented by Artem Valeryevich Kabannik (Novosibirsk, Russia).

According to the abstract* released by the U.S. Patent & Trademark Office: "The position of a droppable object (e.g., a cementing plug or drillpipe dart) in a cased wellbore may be determined in real time during a cementing operation. A pressure data acquisition system is installed at a wellsite and a pressure transducer is installed at the cementing head. As the droppable object travels through casing it encounters regions with a positive or a negative ...