Patents by Inventor Sigve Skjeldal

Sigve Skjeldal 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).

  • Method of producing light weight cement for use of cementation of oil and gas wells
    Patent number: 4385935
    Abstract: A cement slurry of low specific density for cementation of oil-and gas wells is produced by mixing oil-well cement with finely divided emission products comprising amorphous silica dust which has been obtained during the electrothermal preparation of ferrosilicon and/or silicon metal, water, and any desirable dispersion components, the emission products being added in an amount in the range of 1-50% of the total weight of dry material. The emission products can either be mixed with the cement while both components are in the dry state whereupon there is added a sufficient quantity of water in order to obtain a desired specific weight of the slurry or first mixed with water and any other desired dispersion components and this slurry is mixed with the oil-well cement.
    Type: Grant
    Filed: November 24, 1981
    Date of Patent: May 31, 1983
    Assignee: Elkem A/S
    Inventor: Sigve Skjeldal
  • Method of producing light weight cement for use of cementation of oil and gas wells
    Patent number: RE32742
    Abstract: A cement slurry of low specific density for cementation of oil-and gas wells is produced by mixing oil-well cement with finely divided emission products comprising amorphous silica dust which has been obtained during the electrothermal preparation of ferrosilicon and/or silicon metal, water, and any desirable dispersion components, the emission products being added in an amount in the range of 1-50% of the total weight of dry material. The emission products can either be mixed with the cement while both components are in the dry state whereupon there is added a sufficient quantity of water in order to obtain a desired specific weight of the slurry or first mixed with water and any other desired dispersion components and this slurry is mixed with the oil-well cement.
    Type: Grant
    Filed: September 17, 1986
    Date of Patent: September 6, 1988
    Assignee: Elkem a/s
    Inventor: Sigve Skjeldal