ALEXANDRIA, Va., June 17 -- United States Patent no. 12,312,894, issued on May 27, was assigned to TCO AS (Indre Arna, Norway).
"Method for pulling tubulars using a pressure wave" was invented by Geir Arne Melhus (Bryne, Norway) and Jostein Elbert (Kjopmannskjaer, Norway).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for pulling a tubular out of a subterranean well including the steps of: i) lowering a work string into the well which includes a perforating tool and a tubular pulling tool; ii) connecting the tubular pulling tool to the tubular and apply a pulling tension to the tubular; iii) activating the perforating while the applied pulling tension to the tubular is maintained; iv) immediately upo...