公开(公告)号：US20220127922A1

公开(公告)日：2022-04-28

申请号：US17427790

申请日：2020-02-13

Applicant: Aberdeen Holdings Limited

Inventor： Hans Christian Karlsen ,  Eskild Storteig ,  Alagappan Vishwanathan ,  Michael Wardley ,  James Linklater

IPC: E21B31/00 ,  E21B28/00 ,  E21B31/113 ,  E21B31/20

Abstract: A vibratory casing recovery bottom hole assembly and a method of recovering casing in a wellbore. The vibratory casing recovery bottom hole assembly includes a casing spear, a flow modifier and a dynamic amplification tool. The flow modifier produces cyclic variations in fluid pressure through the assembly at a first frequency and the bottom hole assembly is configured to have a natural or resonant frequency when vibrated to be near or at the first frequency. The dynamic amplification tool induces vibration in the bottom hole assembly while ensuring the dynamic amplification factor of the system is greater than one so as to transmit maximum vibration to the casing at the casing spear. Embodiments of dynamic amplification tools are described.