Patents by Inventor Barend Jan Pestman

Barend Jan Pestman 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).

  • Earth formation surveying device
    Patent number: 6241029
    Abstract: A survey device for use in a borehole formed in an earth formation. The device includes a carrier body carrying earth formation survey apparatus and drilling device arranged at the front end of the device for drilling of the borehole, a device for progressing the carrier body through the borehole in correspondence with progress of drilling by the drilling device and a device for removing the rock particles resulting from the drilling process. The device for removing the rock particles comprises a device for transporting the rock particles to the rear end of the device and depositing the rock particles into the borehole behind the rear end of the device.
    Type: Grant
    Filed: October 28, 1999
    Date of Patent: June 5, 2001
    Assignee: Shell Research Limited
    Inventors: Josef Guillaume Christoffel Coenen, Barend Jan Pestman
  • Method of determining in-situ stresses
    Patent number: 6167964
    Abstract: A method is provided for determining an in-situ stress of an earth formation subjected to first, second and a third in-situ stresses, wherein a borehole has been drilled into the formation, the borehole containing a borehole fluid inducing a selected pressure to the borehole wall so that in a region of the formation the first in-situ stress is replaced by another stress depending on the selected pressure induced to the borehole wall.
    Type: Grant
    Filed: July 6, 1999
    Date of Patent: January 2, 2001
    Assignee: Shell Oil Company
    Inventors: Cornelis Jan Kenter, Johannes Gerardus Van Munster, Barend Jan Pestman