Patents by Inventor Mehdi Mir Rajabi

Mehdi Mir Rajabi 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).

  • Device and method for controlling return flow from a bore hole
    Patent number: 9068420
    Abstract: There is provided a device and method for control of return flow from a borehole (18) where drill fluid is supplied from a surface rig (16) via a multi section drill string (4) to a bottom hole assembly (18), the drill pipe sections (6) having tool joints (8) that include an enlarged outer diameter portion (9), and where an annulus (12) is formed between a pipe (2) and the drill string (4), and where the annulus (12) is in fluid communication with or forms part of a return path (40) for the drill fluid, and where a choke (1) is positioned in the annulus (12), and where the length (L) of the choke (1) exceeds the distance (M) between the enlarged outer diameter portion (9) of two adjacent tool joints (8).
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: June 30, 2015
    Assignee: AGR SUBSEA AS
    Inventors: Mehdi Mir Rajabi, Roger Sverre Stave
  • DEVICE AND METHOD FOR CONTROLLING RETURN FLOW FROM A BORE HOLE
    Publication number: 20140251693
    Abstract: There is provided a device and method for control of return flow from a borehole (18) where drill fluid is supplied from a surface rig (16) via a multi section drill string (4) to a bottom hole assembly (18), the drill pipe sections (6) having tool joints (8) that include an enlarged outer diameter portion (9), and where an annulus (12) is formed between a pipe (2) and the drill string (4), and where the annulus (12) is in fluid communication with or forms part of a return path (40) for the drill fluid, and where a choke (1) is positioned in the annulus (12), and where the length (L) of the choke (1) exceeds the distance (M) between the enlarged outer diameter portion (9) of two adjacent tool joints (8).
    Type: Application
    Filed: September 27, 2012
    Publication date: September 11, 2014
    Inventors: Mehdi Mir Rajabi, Roger Sverre Stave