Patents by Inventor Doug DERR

Doug DERR 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).

  • Electromagnetic ranging source suitable for use in a drill string
    Patent number: 9534488
    Abstract: An electromagnetic ranging source includes: a tubular body having a circumference; a ferromagnetic core conforming to the tubular body and extending at least halfway around the circumference to define a gap with circumferentially-spaced poles; one or more current-carrying windings around the core to induce a magnetic field between the poles; and a downhole power source that drives the one or more current-carrying windings. A related method includes: equipping a first drill string with such an electromagnetic ranging source; extending a first borehole with the first drill string; assembling a second drill string with sensors; and drilling a second borehole while using said sensors to guide the second drill string relative to the first borehole.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: January 3, 2017
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Doug Derr, Andrew J. Cuthbert, Joe E. Hess
  • Electromagnetic Ranging Source Suitable for Use in a Drill String
    Publication number: 20160177705
    Abstract: An electromagnetic ranging source embodiment includes: a tubular body having a circumference; a ferromagnetic core conforming to the tubular body and extending at least halfway around the circumference to define a gap with circumferentially-spaced poles; one or more current-carrying windings around the core to induce a magnetic field between the poles; and a downhole power source that drives the one or more current-carrying windings. A method embodiment includes: equipping a first drill string with such an electromagnetic ranging source; extending a first borehole with the first drill string; assembling a second drill string with sensors; and drilling a second borehole while using said sensors to guide the second drill string relative to the first borehole.
    Type: Application
    Filed: July 18, 2014
    Publication date: June 23, 2016
    Inventors: Doug DERR, Andrew J. CUTHBERT, Joe E. HESS