Patents by Inventor Anne-Marie Schulz

Anne-Marie Schulz 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 compositions and application of such compositions to cementing oil wells or the like
    Patent number: 6874578
    Abstract: Method of well cementing with a foamed slurry having a very low water content. When based on ordinary cement, the solid fraction of the slurry includes (by volume) 20-35% Portland cement, 35-65% particles ranging from 200 ?m to 600 ?m, and 5% to 25% of fine particles in the range 0.5 ?m to 5 ?m and the water content is less than 50% by volume. When based on micro-cement, the solid fraction includes (by volume) 50-75% micro-cement, 15-40% fine particles in the range 0.5 ?m to 5 ?m, and 0-20% particles in the rang 3 nanometers to 60 nanometers and the water content is less than 72% by volume.
    Type: Grant
    Filed: February 16, 2000
    Date of Patent: April 5, 2005
    Assignee: Schlumberger Technology Corporation
    Inventors: Andre Garnier, Slaheddine Kefi, Pierre Maroy, Anne-Marie Schulz, Joachim Schulz