Patents by Inventor Jean-Francois Levier

Jean-Francois Levier 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 equipment for performing drilling operations and servicing in an underwater well from a floating surface installation
    Patent number: 4901803
    Abstract: Apparatus for performing drilling operations and for servicing an underwater well from a surface installation comprises a main string that is removable from the top of the wellhead in a way that is totally independent of auxiliary hoses which are hoses suspended from the surface installation independently of the main string and at a distance from it, from separate elements making possible the continuous advance of the hoses. The length of the hoses is adjusted in service so that they form, in the water, a plurality of catenaries supported by the surface installation and connected to the top of the wellhead with interposition of curvature-limiting elements.
    Type: Grant
    Filed: June 27, 1988
    Date of Patent: February 20, 1990
    Assignee: Institut Francais du Petrole
    Inventor: Jean-Francois Levier