Patents by Inventor Ralph Cheung

Ralph Cheung 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).

  • Removal of wellbore residues
    Patent number: 6534449
    Abstract: A wellbore fluid composition effective to reduce oil-containing residue and water wet wellbore surfaces is provided. The fluid composition comprises a terpene composition and a surfactant. Methods for use of the fluid composition as a single spacer or as a multiple spacer in conjunction with a second fluid are provided. Methods for use of the composition in reduction or removal of oil-containing residue from wellbore surfaces, as a clean-up fluid, in wellbore completions, as a displacement fluid, and in wellbore treatment are provided.
    Type: Grant
    Filed: May 25, 2000
    Date of Patent: March 18, 2003
    Assignee: Schlumberger Technology Corp.
    Inventors: Alan Gilmour, Ralph Cheung, Alexander Bui