Patents by Inventor John Villar

John Villar 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).

  • Cementing slurry and method of designing a formulation
    Patent number: 6153562
    Abstract: The present invention provides a cementing composition for an oil or analogous well, essentially constituted by a solid fraction suspended in a liquid medium. The solid fraction is constituted by a coarse fraction with a packing volume fraction .PHI..sub.1 which, according to the invention, is maximised, and a fines fraction x with a packing volume fraction .PHI..sub.2 which is less than or equal to the volume fraction x.sub.0 such that ##EQU1## The invention also provides a method of maximising the value of .PHI..sub.1. The invention can minimise fluid loss whatever the materials selected for a cementing composition.
    Type: Grant
    Filed: October 3, 1997
    Date of Patent: November 28, 2000
    Assignee: Schlumberger Technology Corporation
    Inventors: John Villar, Jean-Francois Baret
  • Cementing compositions and applications of such compositions to cementing oil (or similar) wells
    Patent number: 6060535
    Abstract: The present invention concerns a cementing composition for an oil (or similar) well, based on an aluminous hydraulic cement, fine particles, hollow microspheres, water in a quantity such that the porosity is in the range 25% to 50%, a dispersing agent, a setting accelerator for the aluminous cement and optionally, other conventional additives. The invention is of particular application to cementing conductor pipes in arctic zones or in deep-water wells.
    Type: Grant
    Filed: June 17, 1997
    Date of Patent: May 9, 2000
    Assignee: Schlumberger Technology Corporation
    Inventors: John Villar, Jean-Francois Baret, Michel Michaux, Bernard Dargaud