Patents by Inventor Dan R. Collins

Dan R. Collins 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).

  • Slidable access control device for subterranean lateral well drilling and completion
    Patent number: 5730224
    Abstract: The present invention provides a subterranean structure for controlling tool access to a lateral wellbore extending from a wellbore. The subterranean structure comprises a bushing that is located in the wellbore and proximate an opening to the lateral wellbore and that has an access window therethrough for allowing access by a tool to the lateral well through the opening. The bushing further has a slidable access control device coaxially coupled thereto. Also included is a shifter that is engagable with the slidable access control device to cause the slidable access control device to slide between an open position wherein a tool is allowed to pass through the window and the opening and into the lateral wellbore and a closed position wherein the tool is prevented from passing through the window and the opening and into the lateral wellbore. The present invention also provides a method of controlling tool access to a lateral wellbore extending from a wellbore.
    Type: Grant
    Filed: February 29, 1996
    Date of Patent: March 24, 1998
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jimmie R. Williamson, Dan R. Collins