Patents by Inventor Richard Gerrit Hakvoort

Richard Gerrit Hakvoort 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).

  • Induction logging
    Patent number: 6449561
    Abstract: A method of providing a computed induction log of an induction logging tool run through an interval of a wellbore that extends through a layered formation invaded by wellbore fluid.
    Type: Grant
    Filed: March 21, 2000
    Date of Patent: September 10, 2002
    Assignee: Shell Oil Company
    Inventors: Richard Gerrit Hakvoort, Melis van der Horst
  • Resistivity log correction method
    Patent number: 6098019
    Abstract: A method of determining electric resistivity of an earth formation (1) surrounding a wellbore filled with a wellbore fluid, is provided, which method comprises: operating a resistivity logging tool (2) in the wellbore so as to provide a plurality of resistivity logs (FLG.sub.1, . . . , n) (3) of the earth formation (1) for different radial intervals (1, . . . , n) relative to the wellbore; for each radial interval (k), selecting a modelled resistivity profile (Rmod.sub.k) (4); inputting the modelled resistivity profiles (Rmod.sub.1, . . . , n) (4) to a logging tool simulator (6) so as to provide for each radial interval (k) a modelled resistivity log (MLG.sub.k) (7) having a depth of investigation corresponding to the radial interval (k); for each radial interval (k) updating the modelled resistivity profile (Rmod.sub.k) (7) in dependence of an observed deviation of the resistivity log (FLG.sub.k) (3) from the modelled resistivity log (MLG.sub.
    Type: Grant
    Filed: October 8, 1998
    Date of Patent: August 1, 2000
    Assignee: Shell Oil Company
    Inventors: Richard Gerrit Hakvoort, Johannes Maria Vianney Antonius Koelman