Patents by Inventor Francis J. Shell

Francis J. Shell 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).

  • Enzymatic decomposition of drilling mud
    Patent number: 5165477
    Abstract: Drilling mud is rapidly decomposed by admixing one or more enzymes with the mud to selectively degrade one or more polymeric organic viscosifiers therein. A method of cleaning up a well site drilling mud pit containing drilling mud is provided. Also provided are a composition and method of removing residual drilling mud from a wellbore and around the well face.
    Type: Grant
    Filed: April 8, 1992
    Date of Patent: November 24, 1992
    Assignee: Phillips Petroleum Company
    Inventors: Francis J. Shell, Donald O. Hitzman
  • Enzymatic decomposition of drilling mud
    Patent number: 5126051
    Abstract: Drilling mud is rapidly decomposed by admixing one or more enzymes with the mud to selectively degrade one or more polymeric organic viscosifiers therein. A method of cleaning up a well site drilling mud pit containing drilling mud is provided. Also provided are a composition and method of removing residual drilling mud from a wellbore and around the well face.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: June 30, 1992
    Assignee: Phillips Petroleum Company
    Inventors: Francis J. Shell, Donald O. Hitzman
  • Workover fluid
    Patent number: 4559149
    Abstract: The high temperature water loss property of alkaline well completion and well workover fluids is improved by the addition of an effective amount of a naphthalene sulfonate formaldehyde condensate in the form of its monovalent or bivalent metal salts.
    Type: Grant
    Filed: June 7, 1984
    Date of Patent: December 17, 1985
    Assignee: Phillips Petroleum Company
    Inventor: Francis J. Shell
  • Workover and completion fluids
    Patent number: 4502969
    Abstract: When added to a water-based workover or completion fluid, a mixed polysaccharide such as a malto-dextrin reduces the gel strength and water loss from said fluid, simultaneously increasing yield point.
    Type: Grant
    Filed: April 12, 1982
    Date of Patent: March 5, 1985
    Assignee: Phillips Petroleum Company
    Inventor: Francis J. Shell
  • Process for mounting palynological specimens
    Patent number: 4221823
    Abstract: A process for mounting palynological specimen on a support employing a solution comprising water and at least one substance selected from the group consisting of water-soluble salts of carboxyalkyl hydroxyalkyl cellulose and water-soluble salts of carboxyalkyl cellulose.
    Type: Grant
    Filed: April 21, 1978
    Date of Patent: September 9, 1980
    Assignee: Phillips Petroleum Company
    Inventors: Michael B. Pearson, Sharon A. Meyer, Francis J. Shell