Patents Represented by Attorney Robin D. Nava

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  • 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