Patents by Inventor Nancy M. Krahel

Nancy M. Krahel 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).

  • Patent number: 7681644
    Abstract: A method of managing lost returns in a wellbore includes contacting a filter cake with a treating fluid to remove metallic weighting agents from the filter cake, wherein the filter cake is disposed on a face of a formation fracture in the wellbore. The method also includes contacting the filter cake with a proppant slurry, wherein the proppant slurry contacts the filter cake concurrently with the treating fluid or after the treating fluid contacts the filter cake. This method may include increasing the filter cake permeability and may utilize a barite removal agent, such as a chelation agent. At least one related wellbore management method creates a fracture in the wellbore and props open the fracture to increase wellbore integrity to utilize higher weight drilling fluids and prevent fractures from forming further down the wellbore.
    Type: Grant
    Filed: November 6, 2007
    Date of Patent: March 23, 2010
    Assignee: ExxonMobil Upstream Research Company
    Inventors: John K. Montgomery, Stuart R. Keller, Nancy M. Krahel, Martin V. Smith, Robert S. Williamson