Patents by Inventor John J. Pritchard, Jr.

John J. Pritchard, Jr. 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).

  • Combination hydraulic tubing hanger and chemical injection sub
    Patent number: 5168933
    Abstract: A mudline tubing hanger is disclosed in which the tubing hanger is provided as an integral part of the tubing string and is set within the casing by an hydraulic setting mechanism driven through an external control line and actuated by a wireline shifted sleeve. Further manipulation of the sleeve isolates the setting mechanism from the tubing and external control line, establishing a chemical injection conduit with access to the tubing bore through the external control line.
    Type: Grant
    Filed: October 4, 1991
    Date of Patent: December 8, 1992
    Assignee: Shell Offshore Inc.
    Inventors: John J. Pritchard, Jr., Paul L. Dodd
  • Formation fluid sampler
    Patent number: 4690216
    Abstract: An apparatus for taking a sample of formation fluid and obtaining temperature and pressure data when the apparatus is lowered into a well casing or pipe string, said apparatus comprising: a sampling device; a gun perforator; two packers, one positioned above and the other positioned below the sampling device; and valves carried by the sampling device.
    Type: Grant
    Filed: July 29, 1986
    Date of Patent: September 1, 1987
    Assignee: Shell Offshore Inc.
    Inventor: John J. Pritchard, Jr.
  • Abandoning offshore well
    Patent number: 4688640
    Abstract: A method and apparatus for abandoning an offshore oil or gas well drilled into the ocean floor having a plurality of concentric strings of pipe having throughbores and spaced to form an annular space between adjacent pipe strings. The invention includes perforating the pipe string with an explosive charge of a size, composition, and velocity so as to only penetrate one pipe string without damaging or penetrating any other pipe string in the well.
    Type: Grant
    Filed: June 20, 1986
    Date of Patent: August 25, 1987
    Assignee: Shell Offshore Inc.
    Inventor: John J. Pritchard, Jr.
  • Apparatus for perforating and producing a well
    Patent number: 4655283
    Abstract: An apparatus for perforating the casing wall of a well and producing the well. The apparatus makes use of a dual flow connector having two downwardly-directed ports and carried by a pipe string which is in fluid communication with the upper end thereof. A gun perforator is removably connected to the connector and depends therefrom for closing one port of the connector while a screen is secured to the connector and depends therefrom for closing the other port of the connector.
    Type: Grant
    Filed: June 20, 1986
    Date of Patent: April 7, 1987
    Assignee: Shell Offshore Inc.
    Inventor: John J. Pritchard, Jr.