Patents by Inventor L. Murray Dallas

L. Murray Dallas 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).

  • Patent number: 8297592
    Abstract: A plug valve has a valve body, a cage fitted within the valve body and a rotatable plug housed within a cylindrical cavity in the cage, for controlling fluid flow through the valve. The cage has first and second opposed flat side surfaces, each side surface has a port for receiving a replaceable flow-path insert in a fluid-tight seal. In one embodiment, the plug also includes at least one inset seal for sealing the at least one of the ports when the plug is in a closed position to inhibit leakage through the valve at low fluid pressures.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: October 30, 2012
    Assignee: Stinger Wellhead Protection, Inc.
    Inventors: Bob McGuire, L. Murray Dallas
  • Patent number: 8205916
    Abstract: A metal ring gasket provides a high-pressure temperature tolerant metal-to-metal seal between subcomponents of a threaded union. The metal ring gasket is received in an annular cavity formed between mating surfaces of the subcomponents of the threaded union. The metal ring gasket is capable of maintaining a fluid seal even at very high temperatures resulting from direct exposure to fire. At high fluid pressures the metal ring gasket is energized because hoop stress induced by the fluid pressure forces the metal ring gasket into tighter contact with the subcomponents of the threaded union.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: June 26, 2012
    Assignee: Stinger Wellhead Protection, Inc.
    Inventors: L. Murray Dallas, Bob McGuire, Danny Lee Artherholt
  • Patent number: 8118090
    Abstract: A hybrid wellhead system for a hydrocarbon well, having a wellhead supported by a conductor; an intermediate head spool secured to the wellhead by a hammer union; and a tubing head spool secured to the intermediate head spool by a hammer union.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: February 21, 2012
    Assignee: Stinger Wellhead Protection, Inc.
    Inventors: L. Murray Dallas, Bob McGuire
  • Patent number: 8100175
    Abstract: Fracturing heads with one or more replaceable wear-resistant inserts have annular sealing elements for inhibiting fracturing fluids from circulating between the inserts and a main body of the fracturing head. Worn inserts and degraded sealing elements are easily replaced to refurbish the fracturing head without replacing or rebuilding the main body. Service life of the main body is therefore significantly prolonged. In one embodiment, an entire flow path through the main body is lined with wear-resistant replaceable inserts to further prolong the service life of the main body.
    Type: Grant
    Filed: March 25, 2011
    Date of Patent: January 24, 2012
    Assignee: Stinger Wellhead Protection, Inc.
    Inventors: Bob McGuire, L. Murray Dallas
  • Patent number: 8100185
    Abstract: A multi-lock adapter used to inject high-pressure well stimulation fluids through an independent screwed wellhead includes an adapter pin having a central passageway with an internal diameter at least as large as a passageway through the wellhead. A lockdown flange secures the adapter pin to a casing mandrel of the wellhead. The lockdown flange ensures that stress on connection points to the screwed independent wellhead due to elevated fluid pressures used for well stimulation procedures does not exceed engineered specifications.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: January 24, 2012
    Assignee: Stinger Wellhead Protection, Inc.
    Inventors: Bob McGuire, L. Murray Dallas
  • Publication number: 20110253384
    Abstract: A multi-lock adapter used to inject high-pressure well stimulation fluids through an independent screwed wellhead includes an adapter pin having a central passageway with an internal diameter at least as large as a passageway through the wellhead. A lockdown flange secures the adapter pin to a casing mandrel of the wellhead. The lockdown flange ensures that stress on connection points to the screwed independent wellhead due to elevated fluid pressures used for well stimulation procedures does not exceed engineered specifications.
    Type: Application
    Filed: June 28, 2011
    Publication date: October 20, 2011
    Applicant: STINGER WELLHEAD PROTECTION, INC.
    Inventors: Bob McGuire, L. Murray Dallas
  • Publication number: 20110198074
    Abstract: A hybrid wellhead system for a hydrocarbon well, having a wellhead supported by a conductor; an intermediate head spool secured to the wellhead by a hammer union; and a tubing head spool secured to the intermediate head spool by a hammer union.
    Type: Application
    Filed: March 11, 2011
    Publication date: August 18, 2011
    Applicant: STINGER WELLHEAD PROTECTION, INC.
    Inventors: Bob McGuire, L. Murray Dallas
  • Patent number: 7984758
    Abstract: A multi-lock adapter used to inject high-pressure well stimulation fluids through an independent screwed wellhead includes an adapter pin having a central passageway with an internal diameter at least as large as a passageway through the wellhead. A lockdown flange secures the adapter pin to a casing mandrel of the wellhead. The lockdown flange ensures that stress on connection points to the screwed independent wellhead due to elevated fluid pressures used for well stimulation procedures does not exceed engineered specifications.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: July 26, 2011
    Assignee: Stinger Wellhead Protection, Inc.
    Inventors: Bob McGuire, L. Murray Dallas
  • Publication number: 20110175008
    Abstract: A plug valve has a valve body, a cage fitted within the valve body and a rotatable plug housed within a cylindrical cavity in the cage, for controlling fluid flow through the valve. The cage has first and second opposed flat side surfaces, each side surface has a port for receiving a replaceable flow-path insert in a fluid-tight seal. In one embodiment, the plug also includes at least one inset seal for sealing the at least one of the ports when the plug is in a closed position to inhibit leakage through the valve at low fluid pressures.
    Type: Application
    Filed: March 28, 2011
    Publication date: July 21, 2011
    Applicant: STINGER WELLHEAD PROTECTION, INC.
    Inventors: Bob McGuire, L. Murray Dallas
  • Publication number: 20110175349
    Abstract: A metal ring gasket provides a high-pressure temperature tolerant metal-to-metal seal between subcomponents of a threaded union. The metal ring gasket is received in an annular cavity formed between mating surfaces of the subcomponents of the threaded union. The metal ring gasket is capable of maintaining a fluid seal even at very high temperatures resulting from direct exposure to fire. At high fluid pressures the metal ring gasket is energized because hoop stress induced by the fluid pressure forces the metal ring gasket into tighter contact with the subcomponents of the threaded union.
    Type: Application
    Filed: April 4, 2011
    Publication date: July 21, 2011
    Applicant: STINGER WELLHEAD PROTECTION, INC.
    Inventors: L. Murray Dallas, Bob McGuire, Danny Lee Artherholt
  • Publication number: 20110168384
    Abstract: Fracturing heads with one or more replaceable wear-resistant inserts have annular sealing elements for inhibiting fracturing fluids from circulating between the inserts and a main body of the fracturing head. Worn inserts and degraded sealing elements are easily replaced to refurbish the fracturing head without replacing or rebuilding the main body. Service life of the main body is therefore significantly prolonged. In one embodiment, an entire flow path through the main body is lined with wear-resistant replaceable inserts to further prolong the service life of the main body.
    Type: Application
    Filed: March 25, 2011
    Publication date: July 14, 2011
    Applicant: STINGER WELLHEAD PROTECTION, INC.
    Inventors: Bob McGuire, L. Murray Dallas
  • Patent number: 7967086
    Abstract: A slip spool includes radially disposed actuators for radially moving slip blocks between a loose encirclement position in which they surround the tubing string and a cached position in which the slip blocks clear an axial passage of the slip spool. The slip spool further includes axially disposed actuators for axially displacing the slip blocks between the loose encirclement position and an engagement position in which the slip blocks are seated within a slip bowl of the slip spool so that a weight of the suspended tubing string causes the slip blocks to tightly grip the tubing string. The slip spool facilitates positioning and repositioning of the tubing string in the wellbore and can be used for supporting or snubbing a tubing string in a live well bore.
    Type: Grant
    Filed: June 24, 2010
    Date of Patent: June 28, 2011
    Assignee: Stinger Wellhead Protection, Inc.
    Inventors: Bob McGuire, L. Murray Dallas, Irwin Rosenhauch
  • Patent number: 7950410
    Abstract: A gate valve includes a valve body having a cylindrical passage defining a flow path through the valve, a gate for controlling fluid flow through the valve and a replaceable wear-resistant flow-path liner for in the flow path. The flow-path liner includes a plurality of replaceable wear-resistant inserts, including wear sleeves lining ports of the valve body, valve seats and a gate insert for a flow path bore through the gate. Each replaceable valve seat has a wiper ring for cleaning the gate when it opens and closes. By regularly inspecting and replacing worn-out inserts, the service life of the gate valve can be prolonged and the expense associated with replacing or rebuilding the valve body is avoided.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: May 31, 2011
    Assignee: Stinger Wellhead Protection, Inc.
    Inventors: Bob McGuire, L. Murray Dallas
  • Patent number: 7946558
    Abstract: A plug valve has a valve body, a cage fitted within the valve body and a rotatable plug housed within a cylindrical cavity in the cage, for controlling fluid flow through the valve. The cage has first and second opposed flat side surfaces, each side surface has a port for receiving a replaceable flow-path insert in a fluid-tight seal. In one embodiment, the plug also includes at least one inset seal for sealing the at least one of the ports when the plug is in a closed position to inhibit leakage through the valve at low fluid pressures.
    Type: Grant
    Filed: April 6, 2010
    Date of Patent: May 24, 2011
    Assignee: Stinger Wellhead Protection, Inc.
    Inventors: Bob McGuire, L. Murray Dallas
  • Patent number: 7934546
    Abstract: Fracturing heads with one or more replaceable wear-resistant inserts have annular sealing elements for inhibiting fracturing fluids from circulating between the inserts and a main body of the fracturing head. Worn inserts and degraded sealing elements are easily replaced to refurbish the fracturing head without replacing or rebuilding the main body. Service life of the main body is therefore significantly prolonged. In one embodiment, an entire flow path through the main body is lined with wear-resistant replaceable inserts to further prolong the service life of the main body.
    Type: Grant
    Filed: November 4, 2009
    Date of Patent: May 3, 2011
    Assignee: Stinger Wellhead Protection, Inc.
    Inventors: Bob McGuire, L. Murray Dallas
  • Patent number: 7922216
    Abstract: A metal ring gasket provides a high-pressure temperature tolerant metal-to-metal seal between subcomponents of a threaded union. The metal ring gasket is received in an annular cavity formed between mating surfaces of the subcomponents of the threaded union. The metal ring gasket is capable of maintaining a fluid seal even at very high temperatures resulting from direct exposure to fire. At high fluid pressures the metal ring gasket is energized because hoop stress induced by the fluid pressure forces the metal ring gasket into tighter contact with the subcomponents of the threaded union.
    Type: Grant
    Filed: January 6, 2010
    Date of Patent: April 12, 2011
    Assignee: Stinger Wellhead Protection, Inc.
    Inventors: L. Murray Dallas, Bob McGuire, Danny Lee Artherholt
  • Patent number: 7905293
    Abstract: A hybrid wellhead system is assembled using a plurality of threaded unions, such as spanner nuts or hammer unions, for securing respective tubular heads and a flanged connection for securing a flow control stack to a top of a tubing head spool. The tubing head spool is secured by a threaded union to an intermediate head spool. The intermediate head spool is secured by another threaded union to a wellhead. Each tubular head secures and suspends a tubular string in the well bore. The hybrid wellhead system is capable of withstanding higher fluid pressures than a conventional independent screwed wellhead, while providing a more economical alternative to a flanged, or ranged, wellhead system because it is less expensive to construct and faster to assemble.
    Type: Grant
    Filed: May 14, 2010
    Date of Patent: March 15, 2011
    Assignee: Stinger Wellhead Protection, Inc.
    Inventors: L. Murray Dallas, Bob McGuire
  • Patent number: 7896087
    Abstract: A method of subsurface lubrication facilitates well completion, re-completion and workover while increasing safety and reducing expense. The method involves using a subsurface lubricator mounted to a wellhead of the cased wellbore to lubricate a downhole tool string into the cased wellbore by running a subsurface lubricator through the wellhead and into an upper section of a production casing of the cased wellbore.
    Type: Grant
    Filed: July 21, 2009
    Date of Patent: March 1, 2011
    Assignee: Stinger Wellhead Protection, Inc.
    Inventor: L. Murray Dallas
  • Patent number: 7886833
    Abstract: A low-pressure wellhead system with tubular heads and mandrels secured independently using threaded unions. A casing mandrel is secured to a wellhead by a first threaded union. Likewise, a tubing head spool is secured to the casing mandrel using a threaded union. A tubing hanger is also secured to the tubing head spool using a threaded union. An adapter flange may also be secured to the tubing hanger by a threaded union. Because this low-pressure wellhead is faster and easier to assemble and provides full bore access, there is less rig downtime, thus rendering the well completion process faster and more economical.
    Type: Grant
    Filed: August 23, 2007
    Date of Patent: February 15, 2011
    Assignee: Stinger Wellhead Protection, Inc.
    Inventors: Bob McGuire, L. Murray Dallas
  • Patent number: 7874371
    Abstract: A subsurface lubricator facilitates well completion, re-completion and workover while increasing safety and reducing expense. The subsurface lubricator includes a bi-directional packoff tool on its bottom end. Short hydraulic cylinders lubricate the subsurface lubricator into the well until the bi-directional packoff tool is in a top end of a casing of the well. High pressure fluid pumped through a side port of a wellhead of the well lubricates the subsurface lubricator into the well.
    Type: Grant
    Filed: July 21, 2009
    Date of Patent: January 25, 2011
    Assignee: Stinger Wellhead Protection, Inc.
    Inventor: L. Murray Dallas