Patents by Inventor Darren Ritchie

Darren Ritchie 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).

  • Patent number: 8905158
    Abstract: An underreamer tool for use in a wellbore of an oil or gas well and a method of actuation. In an embodiment, the underreamer tool has body having a longitudinal axis and a fluid conduit, a tool element and an actuation device configured to urge the tool element relative to the body from a first configuration into a second configuration. In this embodiment, a portion of the tool has a curved actuation surface and as the tool element is urged across the curved actuation surface, the tool element is moved radially with respect to the body of the tool. Typically, the actuation device may include a piston driven by pressure of fluid circulated through the fluid flow conduit.
    Type: Grant
    Filed: February 11, 2010
    Date of Patent: December 9, 2014
    Assignee: Paradigm Oilfield Services Limited
    Inventors: Darren Ritchie, Krzysztof Machocki, Alan Mackenzie
  • Publication number: 20120037426
    Abstract: The present invention relates to downhole tools, and in particular an underreamer tool for use in a wellbore of an oil or gas well and a method of actuation. In an embodiment, the underreamer tool has body having a longitudinal axis and a fluid conduit, a tool element and an actuation device configured to urge the tool element relative to the body from a first configuration into a second configuration. In this embodiment, a portion of the tool has a curved actuation surface and as the tool element is urged across the curved actuation surface, the tool element is moved radially with respect to the body of the tool. Typically, the actuation device may include a piston driven by pressure of fluid circulated through the fluid flow conduit.
    Type: Application
    Filed: February 11, 2010
    Publication date: February 16, 2012
    Applicant: Paradigm Oilfield Services Limited
    Inventors: Darren Ritchie, Krzysztof Machocki, Alan Mackenzie