Patents by Inventor Stefan Aernout Hartman

Stefan Aernout Hartman 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).

  • Method and system for sealing an annulus enclosing a tubular element
    Patent number: 9482070
    Abstract: The invention provides a method and a system for sealing an annulus enclosing a tubular element in a wellbore. The method comprises the steps of introducing a first drilling fluid in the wellbore; drilling an open hole section of the wellbore using a drilling tool suspended at the end of a drill string; replacing the drilling fluid with a sealing fluid; extending the tubular element into the open hole section of the wellbore; and flushing part of the sealing fluid out of the wellbore, leaving an annulus between the tubular element and a wellbore wall filled with a layer of sealing fluid. The aforementioned steps may be repeated as required.
    Type: Grant
    Filed: May 6, 2013
    Date of Patent: November 1, 2016
    Assignee: SHELL OIL COMPANY
    Inventors: Stefan Aernout Hartman, Petrus Cornelis Kriesels, Dhivya Sashidhar
  • METHOD AND SYSTEM FOR SEALING AN ANNULUS ENCLOSING A TUBULAR ELEMENT
    Publication number: 20150159467
    Abstract: The invention provides a method and a system for sealing an annulus enclosing a tubular element in a wellbore. The method comprises the steps of introducing a first drilling fluid in the wellbore; drilling an open hole section of the wellbore using a drilling tool suspended at the end of a drill string; replacing the drilling fluid with a sealing fluid; extending the tubular element into the open hole section of the wellbore; and flushing part of the sealing fluid out of the wellbore, leaving an annulus between the tubular element and a wellbore wall filled with a layer of sealing fluid. The aforementioned steps may be repeated as required.
    Type: Application
    Filed: May 6, 2013
    Publication date: June 11, 2015
    Applicant: SHELLA OIL COMPANY
    Inventors: Stefan Aernout Hartman, Petrus Cornelis Kriesels, Dhivya Sashidhar
  • METHOD AND SYSTEM FOR SEALING AN ANNULUS ENCLOSING A TUBULAR ELEMENT
    Publication number: 20150101803
    Abstract: The invention provides a method and system for sealing an annulus enclosing a tubular element in a wellbore. The method comprises the steps of: i) introducing a first drilling fluid in the wellbore; ii) drilling an open hole section of the wellbore using a drilling tool suspended at the end of a tool string; iii) pumping a second drilling fluid comprising particles into the wellbore; iv) filtering the particles out of the second drilling fluid near a downhole end of the tubular element; v) extending the tubular element into the open hole section of the wellbore while directing at least part of the filtered particles to an annulus between the tubular element and a wellbore wall. Steps i) to v) may be repeated as often as required.
    Type: Application
    Filed: May 6, 2013
    Publication date: April 16, 2015
    Inventors: Petrus Cornelis Kriesels, Stefan Aernout Hartman, Erik Kerst Cornelissen, Dhivya Sashidhar