Patents by Inventor David L. ERVIN

David L. ERVIN 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).

  • Cementing whipstock apparatus and methods
    Patent number: 9151136
    Abstract: A system and method facilitate sidetracking by eliminating one or more trips downhole. A sidetracking system includes a whipstock assembly and a stinger assembly. The stinger assembly has a running/stinger assembly which extends at least partially through the whipstock assembly. The running/stinger assembly is designed for disconnection from the whipstock assembly after delivery downhole. After disconnecting the stinger assembly, the sidetracking system enables delivery of cement slurry down through the stinger assembly to form a cement plug at a desired location.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: October 6, 2015
    Assignee: Smith International, Inc.
    Inventor: David L. Ervin
  • CEMENTING WHIPSTOCK APPARATUS AND METHODS
    Publication number: 20140338908
    Abstract: A system and method facilitate sidetracking by eliminating one or more trips downhole. A sidetracking system includes a whipstock assembly and a stinger assembly. The stinger assembly has a running/stinger assembly which extends at least partially through the whipstock assembly. The running/stinger assembly is designed for disconnection from the whipstock assembly after delivery downhole. After disconnecting the stinger assembly, the sidetracking system enables delivery of cement slurry down through the stinger assembly to form a cement plug at a desired location.
    Type: Application
    Filed: July 31, 2014
    Publication date: November 20, 2014
    Inventor: David L. Ervin
  • Cementing whipstock apparatus and methods
    Patent number: 8820437
    Abstract: A technique facilitates sidetracking by eliminating one or more trips downhole. The technique comprises delivering a sidetracking system downhole into a wellbore, and utilizing a component of the sidetracking system to grip a wall of the wellbore. The sidetracking system may comprise a whipstock assembly and a running/stinger assembly in which the stinger assembly is designed for disconnection from the whipstock assembly after delivery downhole. After disconnecting the stinger assembly, the sidetracking system enables delivery of cement slurry down through the stinger assembly to form a cement plug at a desired location.
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: September 2, 2014
    Assignee: Smith International, Inc.
    Inventors: David L. Ervin, Charles H. Dewey, John E. Campbell, Shantanu N. Swadi, Philip M. Gregurek
  • Downhole tools and methods of setting in a wellbore
    Patent number: 8590623
    Abstract: A downhole tool disposed in a drillstring includes a bypass valve unit including at least one bypass port, wherein the bypass port is configured to control fluid flow from a central bore of the drillstring to a wellbore annulus, and an activation sub having a frangible obstruction disposed in a central bore thereof and configured to prevent fluid flow to an anchor downhole during a circulation mode, wherein the frangible obstruction is configured to break at a specified fluid pressure in the central bore to allow fluid communication to below.
    Type: Grant
    Filed: June 16, 2010
    Date of Patent: November 26, 2013
    Assignee: Smith International, Inc.
    Inventor: David L. Ervin
  • CEMENTING WHIPSTOCK APPARATUS AND METHODS
    Publication number: 20110253387
    Abstract: A technique facilitates sidetracking by eliminating one or more trips downhole. The technique comprises delivering a sidetracking system downhole into a wellbore, and utilizing a component of the sidetracking system to grip a wall of the wellbore. The sidetracking system may comprise a whipstock assembly and a running/stinger assembly in which the stinger assembly is designed for disconnection from the whipstock assembly after delivery downhole. After disconnecting the stinger assembly, the sidetracking system enables delivery of cement slurry down through the stinger assembly to form a cement plug at a desired location.
    Type: Application
    Filed: April 13, 2011
    Publication date: October 20, 2011
    Applicant: SMITH INTERNATIONAL, INC.
    Inventor: David L. Ervin
  • DOWNHOLE TOOLS AND METHODS OF SETTING IN A WELLBORE
    Publication number: 20100319934
    Abstract: A downhole tool disposed in a drillstring includes a bypass valve unit including at least one bypass port, wherein the bypass port is configured to control fluid flow from a central bore of the drillstring to a wellbore annulus, and an activation sub having a frangible obstruction disposed in a central bore thereof and configured to prevent fluid flow to an anchor downhole during a circulation mode, wherein the frangible obstruction is configured to break at a specified fluid pressure in the central bore to allow fluid communication to below.
    Type: Application
    Filed: June 16, 2010
    Publication date: December 23, 2010
    Applicant: Smith International, Inc.
    Inventor: David L. ERVIN