Patents Assigned to Ciments d'Origny
  • Lightened cement grout suitable for the cementation of hydrocarbon production wells
    Patent number: 5207832
    Abstract: This invention relates to a lightened gas-impermeable cement grout which comprises hydraulic cement, water, silica fumes in an amount of from about 5 to about 65 weight % based on the weight of the cement, and at least one polyethylene imine having a molecular weight of between about 600,000 and about 1,000,000 in an amount of from about 1 to about 25% weight % based on the weight of the water.
    Type: Grant
    Filed: October 11, 1991
    Date of Patent: May 4, 1993
    Assignees: Total Compagnie Francaise des Petroles, Ciments d'Origny
    Inventors: Daniel Baffreau, Jean-Claude Laugerotte, Nicolas Musikas