Patents by Inventor Rudiger O. Padtberg

Rudiger O. Padtberg 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).

  • Cement slurries, unaffected by salts of magnesium, for cementing wells traversing salt formations, and related cementing processes
    Patent number: 4734134
    Abstract: The slurries according to the invention contain: >18% NaCl; Na silicate and an agent of compatibility with magnesium consisting of H.sub.3 PO.sub.4 and HEDP diphosphonate.Thickening time is not affected by the presence or absence of salts of magnesium, up to 30% of bischofite equivalents. The rheology of the slurry and the compressive strength of the cement are also practically unaffected by magnesium contamination or the lack thereof.
    Type: Grant
    Filed: June 4, 1986
    Date of Patent: March 29, 1988
    Assignee: Dowell Schlumberger Incorporated
    Inventors: Rudiger O. Padtberg, Alfred Garnier