Patents by Inventor Alagappan Vishwanathan

Alagappan Vishwanathan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Well abandonment and slot recovery
    Patent number: 11840900
    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.
    Type: Grant
    Filed: February 13, 2020
    Date of Patent: December 12, 2023
    Assignee: ARDYNE HOLDINGS LIMITED
    Inventors: Hans Christian Karlsen, Eskild Storteig, Alagappan Vishwanathan, Michael Wardley, James Linklater
  • Improvements In Or Relating To Well Abandonment and Slot Recovery
    Publication number: 20220127922
    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.
    Type: Application
    Filed: February 13, 2020
    Publication date: April 28, 2022
    Inventors: Hans Christian Karlsen, Eskild Storteig, Alagappan Vishwanathan, Michael Wardley, James Linklater