Patents by Inventor James Stephen Hall

James Stephen Hall 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).

  • Combined propagation and lateral resistivity downhole tool
    Patent number: 8400160
    Abstract: A combined resistivity tool incorporating both induction/propagation antennas and lateral resistivity antennas disposed in recesses of downhole tubulars, in which a lateral resistivity antenna includes an insulating base layer disposed in the recess; a toroidal antenna disposed over the insulating base layer; and a shield disposed over the recess.
    Type: Grant
    Filed: March 20, 2009
    Date of Patent: March 19, 2013
    Assignee: Schlumberger Technology Corporation
    Inventors: Mark A. Fredette, James Stephen Hall, Mark T. Frey, Dominique Dion
  • COMBINED PROPAGATION AND LATERAL RESISTIVITY DOWNHOLE TOOL
    Publication number: 20090179648
    Abstract: A combined resistivity tool incorporating both induction/propagation antennas and lateral resistivity antennas disposed in recesses of downhole tubulars, in which a lateral resistivity antenna includes an insulating base layer disposed in the recess; a toroidal antenna disposed over the insulating base layer; and a shield disposed over the recess.
    Type: Application
    Filed: March 20, 2009
    Publication date: July 16, 2009
    Inventors: Mark A. Fredette, James Stephen Hall, Mark T. Frey, Dominique Dion
  • Resistivity logging tool and method for building the resistivity logging tool
    Patent number: 7525315
    Abstract: A combined resistivity tool incorporating both induction/propagation antennas and lateral resistivity antennas disposed in recesses of downhole tubulars, in which a lateral resistivity antenna includes an insulating base layer disposed in the recess; a toroidal antenna disposed over the insulating base layer; and a shield disposed over the recess.
    Type: Grant
    Filed: April 1, 2004
    Date of Patent: April 28, 2009
    Assignee: Schlumberger Technology Corporation
    Inventors: Mark A. Fredette, James Stephen Hall, Mark T. Frey, Dominique Dion
  • Method and apparatus for controlling the effect of contact impedance on a galvanic tool in a logging-while-drilling application
    Patent number: 6373254
    Abstract: The present invention describes a method and apparatus to control the effect of contact impedance on a formation resistivity measurement during a logging-while-drilling operation. The control of contact impedance is accomplished by maintaining a substantially zero difference in potential between two monitor electrodes positioned on the resistivity logging tool near a current electrode. The tool can employ a ring electrode configuration and/or a button electrode, configuration. The ring electrode configuration incorporates two pairs of ring monitor electrodes on each side of a ring current electrode. The button electrode configuration incorporates. a monitor electrode, surrounded by a current electrode, surrounded by a second monitor electrode. Insulation gaps are positioned between each electrode to separate the electrodes. A variable current is supplied to the current electrode in each configuration to maintain the same potential at each monitor electrode.
    Type: Grant
    Filed: May 25, 1999
    Date of Patent: April 16, 2002
    Assignee: Schlumberger Technology Corporation
    Inventors: Dominique Dion, Mark T. Frey, James Stephen Hall, Qiming Li, Richard A. Rosthal, Mark A. Fredette
  • Apparatus for protecting a magnetic resonance antenna
    Patent number: 6008646
    Abstract: The instruments of a pulsed nuclear magnetic resonance device are included in a drill collar for evaluating earth formations. The resulting tool makes NMR measurements through an electrically non-conductive shield while the formation is being drilled.
    Type: Grant
    Filed: March 19, 1998
    Date of Patent: December 28, 1999
    Assignee: Schlumberger Technology Corporation
    Inventors: Douglas D. Griffin, James Stephen Hall, Abdurrahman Sezginer
  • Apparatus for protecting a magnetic resonance antenna
    Patent number: 5767674
    Abstract: The instruments of a pulsed nuclear magnetic resonance device are included in a drill collar for evaluating earth formations. The resulting tool makes NMR measurements through an electrically non-conductive shield while the formation is being drilled.
    Type: Grant
    Filed: April 17, 1996
    Date of Patent: June 16, 1998
    Inventors: Douglas D. Griffin, James Stephen Hall, Abdurrahman Sezginer