Patents by Inventor Douglas Lawrence Rock

Douglas Lawrence Rock 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 drilling a bore hole
    Patent number: 7571778
    Abstract: A method to drill a borehole includes drilling the borehole through an overburden with a drill bit selected to optimize a drilling performance parameter and drilling the borehole through a production zone with another drill bit selected to optimize a production performance parameter.
    Type: Grant
    Filed: October 22, 2007
    Date of Patent: August 11, 2009
    Assignee: Smith International, Inc.
    Inventor: Douglas Lawrence Rock
  • Method of drilling a bore hole
    Patent number: 7284623
    Abstract: A method for drilling a borehole through a production zone underlying an overburden of various earth formations includes drilling the borehole through the overburden with a first drill bit. The first drill bit being selected to optimize at least one drilling performance parameter. The method further includes drilling the borehole through at least part of the production zone with a second drill bit. The second drill bit being selected to optimize at least one production performance parameter. Methods for selecting parameters to optimize production performance are also disclosed.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: October 23, 2007
    Assignee: Smith International, Inc.
    Inventor: Douglas Lawrence Rock
  • Method of drilling a bore hole
    Publication number: 20030024736
    Abstract: A method is disclosed for drilling a borehole through a production zone underlying an overburden of various earth formations. The method includes drilling the borehole through the overburden with at least one drill bit adapted to optimize at least one drilling performance parameter, and then drilling the borehole through at least part of the production zone with at least one drill bit adapted to optimize at least one production performance parameter.
    Type: Application
    Filed: July 10, 2002
    Publication date: February 6, 2003
    Inventor: Douglas Lawrence Rock