Patents by Inventor Carel W. J. Hoyer

Carel W. J. Hoyer 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).

  • Method of dynamically controlling bottom hole circulation pressure in a wellbore
    Patent number: 6607042
    Abstract: A method of drilling a well having a first tubular member extending from the surface of the well to a position proximate the bottom of the well. The first tubular member has an inner annulus therethrough. A fluid is pumped into the well through the inner annulus of the first tubular member to flush drilling cuttings out of the well. A fluid is also injected into the well, exterior to the inner annulus, to control the bottom hole circulating pressure in the well.
    Type: Grant
    Filed: May 17, 2001
    Date of Patent: August 19, 2003
    Assignee: Precision Drilling Technology Services Group Inc.
    Inventors: Carel W. J. Hoyer, Robert A. Graham, Adrian Steiner
  • Method of dynamically controlling bottom hole circulation pressure in a wellbore
    Publication number: 20020170749
    Abstract: A method of drilling a well having a first tubular member extending from the surface of the well to a position proximate the bottom of the well. The first tubular member has an inner annulus therethrough. A fluid is pumped into the well through the inner annulus of the first tubular member to flush drilling cuttings out of the well. A fluid is also injected into the well, exterior to the inner annulus, to control the bottom hole circulating pressure in the well.
    Type: Application
    Filed: May 17, 2001
    Publication date: November 21, 2002
    Inventors: Carel W. J. Hoyer, Robert A. Graham, Adrian Steiner