Patents by Inventor Robert Eugene HARGRAVE

Robert Eugene HARGRAVE 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).

  • Vacuum insulated tubing for high pressure, high temperature wells, and systems and methods for use thereof, and methods for making
    Patent number: 11118426
    Abstract: Disclosed is a VIT apparatus for mitigating APB in a wellbore casing annulus of a HPHT deepwater well. The apparatus includes inner and outer tubes formed of 15Cr-135 martensitic stainless steel having a vacuum space therebetween and a weld formed of high yield strength alloy for joining the inner and outer tubes. A protective weld overlay formed of corrosion resistant alloy is placed over the weld. The weld and the weld overlay are formed so as not to extend into the inner bore. Also disclosed are a process for forming the apparatus, and a system and method for using the apparatus. Multiple apparatus are connected by threaded couplings to form an elongated device that can be placed within a casing within a wellbore to carry fluids from the deepwater well to a surface location. When exposed to HPHT well conditions, the vacuum in the VIT apparatus is not lost.
    Type: Grant
    Filed: June 17, 2019
    Date of Patent: September 14, 2021
    Assignee: Chevron U.S.A. Inc.
    Inventors: Robert Eugene Hargrave, Jonathan Scarborough Lee
  • VACUUM INSULATED TUBING FOR HIGH PRESSURE, HIGH TEMPERATURE WELLS, AND SYSTEMS AND METHODS FOR USE THEREOF, AND METHODS FOR MAKING
    Publication number: 20200393065
    Abstract: Disclosed is a VIT apparatus for mitigating APB in a wellbore casing annulus of a HPHT deepwater well. The apparatus includes inner and outer tubes formed of 15Cr-135 martensitic stainless steel having a vacuum space therebetween and a weld formed of high yield strength alloy for joining the inner and outer tubes. A protective weld overlay formed of corrosion resistant alloy is placed over the weld. The weld and the weld overlay are formed so as not to extend into the inner bore. Also disclosed are a process for forming the apparatus, and a system and method for using the apparatus. Multiple apparatus are connected by threaded couplings to form an elongated device that can be placed within a casing within a wellbore to carry fluids from the deepwater well to a surface location. When exposed to HPHT well conditions, the vacuum in the VIT apparatus is not lost.
    Type: Application
    Filed: June 17, 2019
    Publication date: December 17, 2020
    Inventors: Robert Eugene HARGRAVE, Jonathan Scarborough LEE