Patents by Inventor Norbert Heitmann

Norbert Heitmann 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).

  • Reversing differential pressure sticking
    Patent number: 10415333
    Abstract: Apparatus and methods for reducing differential pressure sticking of a drill string stuck against a sidewall of a wellbore by decreasing hydrostatic pressure around the drill string within the wellbore. Drilling fluid is displaced out of the wellbore by injecting a displacement fluid into an annulus defined between the sidewall and an exterior of the drill string, and pressure of the injected displacement fluid within the annulus is decreased by bleeding the injected displacement fluid out of the annulus.
    Type: Grant
    Filed: May 2, 2017
    Date of Patent: September 17, 2019
    Assignee: Schlumberger Technology Corporation
    Inventor: Norbert Heitmann
  • Reversing Differential Pressure Sticking
    Publication number: 20180320464
    Abstract: Apparatus and methods for reducing differential pressure sticking of a drill string stuck against a sidewall of a wellbore by decreasing hydrostatic pressure around the drill string within the wellbore. Drilling fluid is displaced out of the wellbore by injecting a displacement fluid into an annulus defined between the sidewall and an exterior of the drill string, and pressure of the injected displacement fluid within the annulus is decreased by bleeding the injected displacement fluid out of the annulus.
    Type: Application
    Filed: May 2, 2017
    Publication date: November 8, 2018
    Inventor: Norbert Heitmann