Patents by Inventor Stefan Eric Edward Calvert

Stefan Eric Edward Calvert 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 of correcting density logs for the presence of the casing
    Patent number: 7328106
    Abstract: A gas detection method includes carrying out respective neutron and density logs, using neutron and density detectors, along a length of well. The density log is corrected for the dimensions and properties of the well casing. The corrected density log is then combined with the neutron log to compensate for regions of artificially high density outside the casing. The compensated density log is continuously calibrated against the neutron log. The dynamically calibrated density and neutron logs are inspected for crossovers that signify the presence of gas in a formation.
    Type: Grant
    Filed: June 3, 2005
    Date of Patent: February 5, 2008
    Assignee: Reeves Wireline Technologies Limited
    Inventors: Stefan Eric Edward Calvert, Charles Alexander Pereira, James Roger Samworth
  • Method of through-casing gas detection
    Patent number: 6909969
    Abstract: A gas detection method includes carrying out respective neutron and density logs, using neutron and density detectors, along a length of well. The density log is corrected for the dimensions and properties of the well casing. The corrected density log is then combined with the neutron log to compensate for regions of artificially high density outside the casing. The compensated density log is continuously calibrated against the neutron log. The dynamically calibrated density and neutron logs are inspected for crossovers that signify the presence of gas in a formation.
    Type: Grant
    Filed: March 21, 2003
    Date of Patent: June 21, 2005
    Assignee: Reeves Wireline Technologies Limited
    Inventors: Stefan Eric Edward Calvert, Charles Alexander Pereira, James Roger Samworth
  • Method of through-casing gas detection
    Publication number: 20030216866
    Abstract: In the field of through-casing gas detection related to oil production there is a need to identify the presence of gas in a formation.
    Type: Application
    Filed: March 21, 2003
    Publication date: November 20, 2003
    Inventors: Stefan Eric Edward Calvert, Charles Alexander Pereira, James Roger Samworth