ALEXANDRIA, Va., July 14 -- United States Patent no. 12,680,408, issued on July 14, was assigned to ARDYNE HOLDINGS Ltd. (Aberdeen, Great Britain).
"Methods and apparatus for casing recovery" was invented by Alan Fairweather (Aberdeen, Great Britain), David Stewart (Aberdeen, Great Britain) and James Linklater (Aberdeen, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "Method of removing casing from a well, in which an annulus between the outside of the casing and the inside of a surrounding downhole body is at least partially filled by debris, the perforated section of casing is washed in casing lengths shorter than the perforation length and an attempt made to pull the casing after each shorter...