Patents by Inventor Stuart Morton Dennistoun

Stuart Morton Dennistoun 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).

  • Dual Control Line System and Method for Operating Surface Controlled Sub-Surface Safety Valve in a Well
    Publication number: 20090050333
    Abstract: A control system for a surface controlled sub-surface safety valve has first and second control lines. The first control line communicates control fluid to the sub-surface safety valve and preferably has a sump and in-line filters. Hydraulic pressure applied to the safety valve with this first control line can open the safety valve. The second control line also communicates control fluid to the sub-surface safety valve and preferably has a sump. A connecting valve is connected between the first and second control lines. The connecting valve allows control fluid to communicate from the first control line to the safety valve but prevents fluid communication from the second control line to the first control line. To open the valve, the second control line is exhausted to a reservoir. The dual control lines provide redundant control of the safety valve and can also be cycled to remove debris from the system.
    Type: Application
    Filed: August 20, 2007
    Publication date: February 26, 2009
    Applicant: Weatherford/Lamb, Inc.
    Inventors: Roddie Robert Smith, Richard Coleman Jones, Stuart Morton Dennistoun
  • Valve with secondary load bearing surface
    Patent number: 6425413
    Abstract: A valve (120) for controlling fluid flow therethrough in downhole applications is disclosed. The valve (120) comprises a valve housing having a valve closure mechanism (122) and a valve seat (124) disposed therein. The valve closure mechanism (122) has sealing surface (128) and a secondary load bearing surface (142). The valve seat (124) has a valve seat sealing surface (126) that mates with the sealing surface (128) of the valve closure mechanism (122). The secondary load bearing surface (142) of the valve closure mechanism (122) mates with a valve secondary load bearing surface (134) which may be supported by the valve seat (124).
    Type: Grant
    Filed: April 17, 2001
    Date of Patent: July 30, 2002
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Glenn Ray Davis, Stuart Morton Dennistoun
  • Valve with secondary load bearing surface
    Publication number: 20010022194
    Abstract: A valve (120) for controlling fluid flow therethrough in downhole applications is disclosed. The valve (120) comprises a valve housing having a valve closure mechanism (122) and a valve seat (124) disposed therein. The valve closure mechanism (122) has sealing surface (128) and a secondary load bearing surface (142). The valve seat (124) has a valve seat sealing surface (126) that mates with the sealing surface (128) of the valve closure mechanism (122). The secondary load bearing surface (142) of the valve closure mechanism (122) mates with a valve secondary load bearing surface (134) which may be supported by the valve seat (124).
    Type: Application
    Filed: April 17, 2001
    Publication date: September 20, 2001
    Applicant: Halliburton Enrgy Services, Inc.
    Inventors: Glenn Ray Davis, Stuart Morton Dennistoun
  • Valve with secondary load bearing surface
    Patent number: 6263910
    Abstract: A valve (120) for controlling fluid flow therethrough in downhole applications is disclosed. The valve (120) comprises a valve housing having a valve closure mechanism (122) and a valve seat (124) disposed therein. The valve closure mechanism (122) has sealing surface (128) and a secondary load bearing surface (142). The valve seat (124) has a valve seat sealing surface (126) that mates with the sealing surface (128) of the valve closure mechanism (122). The secondary load bearing surface (142) of the valve closure mechanism (122) mates with a valve secondary load bearing surface (134) which may be supported by the valve seat (124).
    Type: Grant
    Filed: January 14, 2000
    Date of Patent: July 24, 2001
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Glenn Ray Davis, Stuart Morton Dennistoun