Patents by Inventor Thomas E. Ferg

Thomas E. Ferg 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 and apparatus for cementing an air drilled well
    Patent number: 6520256
    Abstract: A downhole cementing system employing a cement choke within the casing to reduce the downward velocity of cement through the casing and thereby inhibit formation fracturing caused by vibration of the casing. The cement choke includes a tubular body defining a fluid passageway, a seat coupled to the tubular body and defining a seat orifice, a choke element coupled to the seat and restricting flow through the seat orifice, and a check valve coupled to the seat and operable to substantially block fluid flow through the seat orifice.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: February 18, 2003
    Inventor: Thomas E. Ferg
  • Downhole cementing system
    Publication number: 20020153138
    Abstract: A downhole cementing system employing a cement choke within the casing to reduce the downward velocity of cement through the casing and thereby inhibit formation fracturing caused by vibration of the casing.
    Type: Application
    Filed: April 20, 2001
    Publication date: October 24, 2002
    Applicant: PHILLIPS PETROLEUM COMPANY
    Inventor: Thomas E. Ferg
  • Method for measuring height of fill in a production tubing/casing annulus
    Patent number: 5569914
    Abstract: The location in a wellbore of the top of a quantity of fill material which is sufficient to restrict flow in a tubing/casing annulus at a location deep in a well is determined by dropping a radioactive source through the annulus so that it falls to the top of the fill material. The depth of the thus deposited radioactive source is detected by radiation measurements, and the measured depth infers the location of the top of the fill material.
    Type: Grant
    Filed: September 18, 1995
    Date of Patent: October 29, 1996
    Assignee: Phillips Petroleum Company
    Inventor: Thomas E. Ferg