Patents by Inventor Nils Blomberg

Nils Blomberg 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).

  • Hydraulic cement slurry
    Patent number: 4933031
    Abstract: Hydraulic cement slurry for use in cementation of oil wells containing hydraulic cement, 5-100% microsilica based on the weight of cement, 2-200% light weight aggregate with a real particle density between 0.1 and 1.5 g/cm.sup.3 based on the weight of the cement, 0-5% thinner (dry weight) based on the weight of the cement, 0-10% fluid loss additive (dry weight) based on the weight of the cement, and water in such an amount that the cement slurry has a density between 0.8 and 2.0 g/cm.sup.3.The cement slurry according to the present invention is gas tight and can thereby be used for cementation of oil well in fields having gas containing formations.
    Type: Grant
    Filed: September 17, 1987
    Date of Patent: June 12, 1990
    Assignee: Elkem a/s and Den norske stats oljeselskap a.s.
    Inventors: Nils Blomberg, Eldar O. Dingsoyr, Per J. Svenkerud, Bjorn Vassoye