Patents by Inventor David Nowowiejski

David Nowowiejski 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).

  • Multi-zone hydraulic stimulation system
    Patent number: 11280160
    Abstract: A system includes a string disposed in a wellbore, a first valve coupled to the string, the first valve including a sleeve having an engagement profile with a first coded sequence, a second valve coupled to the string, the second valve including a sleeve having an engagement profile with a second coded sequence that differs from the first coded sequence of the first valve, and a first dart flow transportable through the string, the first dart including a collet finger having a first coded sequence configured to restrict the collet finger from matingly engaging the engagement profile of the first valve while permitting the collet finger to engage the engagement profile of the second valve, wherein the first dart actuates the sleeve of the second valve between first and second positions in response to the collet finger of the first dart matingly engaging the engagement profile of the second valve.
    Type: Grant
    Filed: November 29, 2018
    Date of Patent: March 22, 2022
    Assignee: National Oilwell Varco, L.P.
    Inventors: Sean Calahan, Aju Abraham, David Nowowiejski, Chris Shewchuk
  • MULTI-ZONE HYDRAULIC STIMULATION SYSTEM
    Publication number: 20210002982
    Abstract: A system includes a string disposed in a wellbore, a first valve coupled to the string, the first valve including a sleeve having an engagement profile with a first coded sequence, a second valve coupled to the string, the second valve including a sleeve having an engagement profile with a second coded sequence that differs from the first coded sequence of the first valve, and a first dart flow transportable through the string, the first dart including a collet finger having a first coded sequence configured to restrict the collet finger from matingly engaging the engagement profile of the first valve while permitting the collet finger to engage the engagement profile of the second valve, wherein the first dart actuates the sleeve of the second valve between first and second positions in response to the collet finger of the first dart matingly engaging the engagement profile of the second valve.
    Type: Application
    Filed: November 29, 2018
    Publication date: January 7, 2021
    Applicant: NATIONAL OILWELL VARCO, L.P.
    Inventors: Sean Calahan, Aju Abraham, David Nowowiejski, Chris Shewchuk