The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 02, 2021
Filed:
Apr. 20, 2017
Ardyne Holdings Limited, Aberdeen, GB;
Steffen Evertsen, Tanager, NO;
ARDYNE HOLDINGS LIMITED, Aberdeen, GB;
Abstract
Apparatus and method for removing a section of casing or lining from a wellbore. A tubular mandrel has a sliding assembly mounted thereon with grippers coupled to the assembly so that the grippers can be moved between an engaged configuration were they grip the inner wall of the casing section and a disengaged position were they are held away from the inner wall. A switcher is mounted on the mandrel which operates on entering the casing section to lock the grippers in the disengaged position so that cutting of the casing may be done. On pulling the switcher from the casing section, the grippers are automatically engaged and grip the upper end of casing section so that it can be removed. Additional locking arrangements are described which, by rotation, maintain the grippers in the disengaged position regardless of the location of the switcher.