Patents by Inventor David John Stephenson

David John Stephenson 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).

  • METHOD AND APPARATUS FOR WELL TUBULAR FLOTATION
    Publication number: 20240068311
    Abstract: A wellbore tubular flotation device comprises a housing having a locking element disposed thereon. The housing is shaped to move through an interior of a wellbore tubular segment. The locking element is shaped to engage the interior of the wellbore tubular segment. The locking element comprises a locking mechanism configured to urge the locking element into contact with the interior of the wellbore tubular. A burst disk is engaged with the housing and is shaped to close the tubular segment to fluid flow. A release mechanism is configured to reverse the urging of the locking mechanism when a release tool is moved through the housing.
    Type: Application
    Filed: November 7, 2023
    Publication date: February 29, 2024
    Inventors: David John Stephenson, Tomasz Jozef Walerianczyk
  • Method and apparatus for well tubular flotation
    Patent number: 11828119
    Abstract: A wellbore tubular flotation device comprises a housing having a locking element disposed thereon. The housing is shaped to move through an interior of a wellbore tubular segment. The locking element is shaped to engage the interior of the wellbore tubular segment. The locking element comprises a locking mechanism configured to urge the locking element into contact with the interior of the wellbore tubular. A burst disk is engaged with the housing and is shaped to close the tubular segment to fluid flow. A release mechanism is configured to reverse the urging of the locking mechanism when a release tool is moved through the housing.
    Type: Grant
    Filed: August 10, 2021
    Date of Patent: November 28, 2023
    Assignee: Deep Casing Tools, Ltd.
    Inventors: David John Stephenson, Tomasz Jozef Walerianczyk
  • METHOD AND APPARATUS FOR WELL TUBULAR FLOTATION
    Publication number: 20210363843
    Abstract: A wellbore tubular flotation device comprises a housing having a locking element disposed thereon. The housing is shaped to move through an interior of a wellbore tubular segment. The locking element is shaped to engage the interior of the wellbore tubular segment. The locking element comprises a locking mechanism configured to urge the locking element into contact with the interior of the wellbore tubular. A burst disk is engaged with the housing and is shaped to close the tubular segment to fluid flow. A release mechanism is configured to reverse the urging of the locking mechanism when a release tool is moved through the housing.
    Type: Application
    Filed: August 10, 2021
    Publication date: November 25, 2021
    Inventors: David John Stephenson, Tomasz Jozef Walerianczyk
  • Method for removing casing from a wellbore
    Patent number: 10934796
    Abstract: A method for recovering a conduit from a wellbore includes positioning an expander tool having at least one biasing element within the conduit an expander tool and exerting a force against the at least one biasing element to radially expand the conduit to an amount sufficient to fracture solids outside of and in contact with the conduit.
    Type: Grant
    Filed: November 15, 2018
    Date of Patent: March 2, 2021
    Assignee: Deep Casing Tools, Ltd.
    Inventors: David John Stephenson, Tomasz Jozef Walerianczyk, Neil Andrew Abercrombie Simpson
  • METHOD FOR REMOVING CASING FROM A WELLBORE
    Publication number: 20190345787
    Abstract: A method for recovering a conduit from a wellbore includes positioning an expander tool having at least one biasing element within the conduit an expander tool and exerting a force against the at least one biasing element to radially expand the conduit to an amount sufficient to fracture solids outside of and in contact with the conduit.
    Type: Application
    Filed: November 15, 2018
    Publication date: November 14, 2019
    Inventors: David John Stephenson, Tomasz Jozef Walerianczyk, Neil Andrew Abercrombie Simpson