Patents by Inventor Randel E. Stong

Randel E. Stong 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).

  • High temperature drilling fluids
    Patent number: 4602067
    Abstract: An aqueous drilling fluid suitable for high-temperature use comprising a water base, clay suspended in said base and from about 0.01-25 pounds per barrel total composition of a hydrolyzed terpolymer of maleic anhydride, styrene and a third monomer selected from acrylamide, methacrylamide, acrylic acid or methacrylic acid, the molar ratio of maleic anhydride to styrene to said third monomer being from about 30:10:60 to 50:40:10, and the alkali metal, ammonium and lower aliphatic amine salts thereof, the weight-average molecular weight of said hydrolyzed terpolymer being from about 500-10,000. An improved drilling process wherein such fluids remain flowable at elevated temperatures is also disclosed.
    Type: Grant
    Filed: March 28, 1985
    Date of Patent: July 22, 1986
    Assignee: Pfizer Inc.
    Inventors: Randel E. Stong, Stanley W. Walinsky
  • High temperature drilling fluids
    Patent number: 4566978
    Abstract: An aqueous drilling fluid suitable for high-temperature use comprising a water base, clay suspended in said base and from about 0.01-25 pounds per barrel total composition of a hydrolyzed terpolymer of maleic anhydride, styrene and a third monomer selected from acrylamide, methacrylamide, acrylic acid or methacrylic acid, the molar ratio of maleic anhydride to styrene to said third monomer being from about 30:10:60 to 50:40:10, and the alkali metal, ammonium and lower aliphatic amine salts thereof, the weight-average molecular weight of said hydrolyzed terpolymer being from about 500-10,000. An improved drilling process wherein such fluids remain flowable at elevated temperatures is also disclosed.
    Type: Grant
    Filed: May 21, 1984
    Date of Patent: January 28, 1986
    Assignee: Pfizer Inc.
    Inventors: Randel E. Stong, Stanley W. Walinsky