Patents by Inventor David John Stuart

David John Stuart 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).

  • Liner anchor for expandable casing strings and method of use
    Patent number: 7617868
    Abstract: Expandable casing has an expandable slip used for completion of a mono-diameter wellbore. The expandable casing is run through the upper casing and has an upper end that overlaps a lower end of the upper casing to form a fluid flow path between the expandable casing and the upper casing. The operator expands the overlapping portion of the expandable casing to an intermediate position, causing the expandable slip to anchor the expandable casing to the upper causing without blocking the flow path. Cement is then pumped up around the outside of the expandable casing and wellbore fluid displaced by the cement and excess cement are permitted to flow through the fluid flow path and up the upper casing. After sufficient cement is in place, the expandable casing is further expanded, compressing the expandable slip into to the inner wall of the upper casing and sealing off the fluid flow path.
    Type: Grant
    Filed: April 10, 2008
    Date of Patent: November 17, 2009
    Assignee: Baker Hughes Incorporated
    Inventors: David John Stuart, Robert C. Smith
  • Liner anchor for expandable casing strings and method of use
    Publication number: 20080210440
    Abstract: Expandable casing has an expandable slip used for completion of a mono-diameter wellbore. The expandable casing is run through the upper casing and has an upper end that overlaps a lower end of the upper casing to form a fluid flow path between the expandable casing and the upper casing. The operator expands the overlapping portion of the expandable casing to an intermediate position, causing the expandable slip to anchor the expandable casing to the upper causing without blocking the flow path. Cement is then pumped up around the outside of the expandable casing and wellbore fluid displaced by the cement and excess cement are permitted to flow through the fluid flow path and up the upper casing. After sufficient cement is in place, the expandable casing is further expanded, compressing the expandable slip into to the inner wall of the upper casing and sealing off the fluid flow path.
    Type: Application
    Filed: April 10, 2008
    Publication date: September 4, 2008
    Inventors: David John Stuart, Robert C. Smith
  • Liner anchor for expandable casing strings and method of use
    Patent number: 7367391
    Abstract: Expandable casing has an expandable slip used for completion of a mono-diameter wellbore. The expandable casing is run through the upper casing and has an upper end that overlaps a lower end of the upper casing to form a fluid flow path between the expandable casing and the upper casing. The operator expands the overlapping portion of the expandable casing to an intermediate position, causing the expandable slip to anchor the expandable casing to the upper causing without blocking the flow path. Cement is then pumped up around the outside of the expandable casing and wellbore fluid displaced by the cement and excess cement are permitted to flow through the fluid flow path and up the upper casing. After sufficient cement is in place, the expandable casing is further expanded, compressing the expandable slip into to the inner wall of the upper casing and sealing off the fluid flow path.
    Type: Grant
    Filed: December 28, 2006
    Date of Patent: May 6, 2008
    Assignee: Baker Hughes Incorporated
    Inventors: David John Stuart, Robert C. Smith