Patents by Inventor David D. Onan

David D. Onan 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: 6279652
    Abstract: The present invention provides heat insulation compositions and methods. The compositions are basically comprised of an epoxide containing liquid, an insulating material and an epoxide hardening agent.
    Type: Grant
    Filed: September 23, 1998
    Date of Patent: August 28, 2001
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, David D. Onan, Roger S. Cromwell
  • Patent number: 6231664
    Abstract: The present invention provides improved well sealing compositions and methods. The compositions are basically comprised of slag cement, water, a slag cement set activator, a hardenable epoxide containing material and an epoxide containing material hardening agent.
    Type: Grant
    Filed: March 8, 2000
    Date of Patent: May 15, 2001
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, David D. Onan, Roger S. Cromwell, Bobby J. King
  • Patent number: 6098711
    Abstract: The present invention provides improved compositions and methods for sealing pipe in well bores. The compositions are basically comprised of an aqueous rubber latex, a rubber latex activator for causing the latex to harden, an organosilane and a filler.
    Type: Grant
    Filed: August 18, 1998
    Date of Patent: August 8, 2000
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, Roger S. Cromwell, David D. Onan, Bobby J. King
  • Patent number: 6069117
    Abstract: The present invention provides improved foamed hardenable epoxy resin sealing compositions and methods which are particularly useful in the construction and repair of wells. The foamed epoxy resin compositions are corrosion resistant and have improved mechanical properties including elasticity and ductility.
    Type: Grant
    Filed: August 20, 1999
    Date of Patent: May 30, 2000
    Assignee: Halliburton Energy Services, Inc.
    Inventors: David D. Onan, Jiten Chatterji, Roger S. Cromwell
  • Patent number: 6068055
    Abstract: The present invention provides improved well sealing compositions and methods. The compositions are basically comprised of slag cement, water, a slag cement set activator, a hardenable epoxide containing material and an epoxide containing material hardening agent.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: May 30, 2000
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, David D. Onan, Roger S. Cromwell, Bobby J. King
  • Patent number: 6059035
    Abstract: The present invention provides sealing methods and compositions for use in subterranean zones penetrated by well bores. The methods of the invention basically include the steps of preparing a sealing composition which includes an aqueous silicate solution, an epoxide containing liquid and a delayed epoxide hardening agent, placing the sealing composition into a subterranean zone and allowing the sealing composition to set into a rigid impermeable sealing mass in the zone.
    Type: Grant
    Filed: July 20, 1998
    Date of Patent: May 9, 2000
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, David D. Onan, Bobby J. King, Roger S. Cromwell
  • Patent number: 6059036
    Abstract: The present invention provides methods and compositions for sealing subterranean zones. The methods of the invention basically comprise the steps of preparing a sealing composition comprised of an aqueous alkali metal silicate solution, a gelling agent and a delayed acid activator for causing the composition to set into a rigid mass, placing the sealing composition in said subterranean zone and allowing the sealing composition to set into a rigid sealing mass therein.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: May 9, 2000
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, Lewis R. Norman, David D. Onan, Bobby J. King, Roger S. Cromwell
  • Patent number: 6055874
    Abstract: The present invention provides methods and apparatus for simulating well bore conditions before and after cementing therein. The methods of the invention are basically comprised of the steps of circulating a drilling fluid through a closed test cell containing a permeable rock core while maintaining a selected pressure differential across the rock core to form a layer of filter cake thereon, circulating a filter cake removal fluid through the test cell to simulate the clean-up of the well bore and then determining the condition of the rock core with respect to the effectiveness of the filter cake removal fluid thereon.
    Type: Grant
    Filed: February 2, 1999
    Date of Patent: May 2, 2000
    Assignee: Halliburton Energy Services, Inc.
    Inventors: David D. Onan, Dennis W. Gray, Russell M. Fitzgerald, Johnny W. Johnson
  • Patent number: 6012524
    Abstract: The present invention relates to improved methods and compositions for sealing subterranean zones penetrated by well bores to reduce their permeabilities and increase their compressive strengths. The methods basically comprise the steps of introducing an aqueous sealing composition into a subterranean zone comprising a polymerizable monomer, a polymerization initiator, a hardenable epoxide containing liquid and a hardening agent, placing the sealing composition by way of the well bore into the subterranean zone and allowing the sealing composition to polymerize and harden whereby the well bore is sealed.
    Type: Grant
    Filed: April 14, 1998
    Date of Patent: January 11, 2000
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, David D. Onan, Roger S. Cromwell
  • Patent number: 6006836
    Abstract: The present invention provides improved methods of sealing a bridge plug or the like in a pipe disposed in a well bore. The methods basically include the steps of preparing a hardenable epoxy sealing composition which hardens into a resilient solid mass having a high pipe surface bond strength, placing the epoxy composition into the pipe adjacent to the bridge plug therein and allowing the epoxy composition to harden.
    Type: Grant
    Filed: May 29, 1998
    Date of Patent: December 28, 1999
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, David D. Onan, Patty L. Onan, Roger S. Cromwell, Bobby J. King
  • Patent number: 6006835
    Abstract: The present invention provides improved foamed hardenable epoxy resin sealing compositions and methods which are particularly useful in the construction and repair of wells. The foamed epoxy resin compositions are corrosion resistant and have improved mechanical properties including elasticity and ductility.
    Type: Grant
    Filed: February 17, 1998
    Date of Patent: December 28, 1999
    Assignee: Halliburton Energy Services, Inc.
    Inventors: David D. Onan, Jiten Chatterji, Roger S. Cromwell
  • Patent number: 5968879
    Abstract: Polymeric well completion and remedial compositions which form highly pliable impermeable masses of desired rigidity and methods of using the compositions are provided. The compositions are basically comprised of water, a water soluble polymerizable monomer, a polymerization initiator and an oxygen scavenging agent. The composition is usually foamed and contains a gelling agent and a solid filler material to increase the density and/or rigidity of the impermeable mass formed.
    Type: Grant
    Filed: May 12, 1997
    Date of Patent: October 19, 1999
    Assignee: Halliburton Energy Services, Inc.
    Inventors: David D. Onan, Jiten Chatterji, Roger S. Cromwell
  • Patent number: 5969006
    Abstract: The present invention relates to improved methods of sealing openings in a well bore penetrating a subterranean zone into which fluids contained in the well bore are lost or from which fluids undesirably flow into the well bore. The methods basically comprise the steps of preparing a hardenable epoxy sealing composition comprising an epoxide containing liquid and a hardening agent, placing the epoxy sealing composition by way of the well bore into the openings and into the subterranean zone and allowing the epoxy composition to harden whereby the well bore is sealed.
    Type: Grant
    Filed: February 20, 1998
    Date of Patent: October 19, 1999
    Assignee: Halliburton Energy Services, Inc.
    Inventors: David D. Onan, Jiten Chatterji, Bobby J. King, Roger S. Cromwell, Patty L. Onan
  • Patent number: 5957204
    Abstract: The present invention provides methods of sealing conduits in multi-lateral wells whereby the sealant can withstand stress induced conduit movements without failure. The methods basically include the steps of preparing a hardenable epoxy composition having flexibility and resiliency upon hardening including an epoxide containing liquid or an epoxy resin and an epoxide containing liquid and a hardening agent. The epoxy composition is placed into a lateral well bore between a conduit therein and the walls of the lateral well bore and allowed to harden therein.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: September 28, 1999
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, David D. Onan, Roger S. Cromwell, Bobby J. King
  • Patent number: 5945387
    Abstract: Polymeric well completion and remedial compositions which form highly pliable and durable impermeable masses of desired rigidity and methods of using the compositions are provided. The compositions are basically comprised of water, a water soluble polymerizable monomer, a polymerization initiator and an oxygen scavenging agent. The compositions are usually foamed and can contain a gelling agent and a solid filler material to increase the density and/or rigidity of the impermeable mass formed and/or a vulcanizable rubber latex, vulcanizing agent and vulcanizing activator to provide durability and other properties.
    Type: Grant
    Filed: June 23, 1997
    Date of Patent: August 31, 1999
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, David D. Onan, Roger S. Cromwell
  • Patent number: 5911282
    Abstract: The present invention provides improved well drilling fluids containing epoxy sealants and methods of drilling well bores using the drilling fluids. The drilling fluids basically include a base fluid selected from the group of water and oil, a viscosity increasing material and a hardenable epoxy sealant composition which becomes part of the filter cake formed on the walls of the well bore and hardens therein whereby the filter cake is consolidated into a stable solid mass.
    Type: Grant
    Filed: December 11, 1997
    Date of Patent: June 15, 1999
    Assignee: Halliburton Energy Services, Inc.
    Inventors: David D. Onan, Jiten Chatterji, Bobby J. King, Roger S. Cromwell, Patty L. Onan
  • Patent number: 5897699
    Abstract: The present invention relates to improved foamed well cement compositions, additives and methods. The additives, which foam and stabilize a cement slurry containing freshwater or saltwater, are basically comprised of an aqueous solution of an alpha-olefinic sulfonate surfactant and a betaine surfactant.
    Type: Grant
    Filed: July 23, 1997
    Date of Patent: April 27, 1999
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, David D. Onan, Roger S. Cromwell, Bobby J. King
  • Patent number: 5875846
    Abstract: The present invention provides methods of modifying the properties of a subterranean stratum penetrated by a well bore to increase its strength and decrease its permeability. The methods basically include the steps of preparing a hardenable epoxy composition having flexibility upon hardening, pumping the epoxy composition into the subterranean stratum by way of the well bore and by way of the porosity of the stratum and then allowing the epoxy composition to harden in the stratum.
    Type: Grant
    Filed: May 29, 1998
    Date of Patent: March 2, 1999
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, David D. Onan, Patty L. Onan, Roger S. Cromwell, Bobby J. King
  • Patent number: 5875844
    Abstract: The present invention provides improved methods of sealing a string of pipe in a well bore. The methods basically include the steps of preparing a hardenable epoxy sealing composition which hardens into a solid mass having flexibility and resiliency comprising an epoxide containing liquid and a hardening agent, placing the epoxy composition in the annulus between the string of pipe and the walls of the well bore and allowing the epoxy resin to harden.
    Type: Grant
    Filed: February 26, 1998
    Date of Patent: March 2, 1999
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, David D. Onan, Roger S. Cromwell, Bobby J. King, Patty L. Onan
  • Patent number: 5875845
    Abstract: The present invention provides improved methods and compositions for sealing a pipe string in a well bore. The methods basically include the steps of preparing a hardenable epoxy sealing composition which hardens into a resilient solid mass having high bond strength comprising an epoxide containing liquid, an organosilane compound and a hardening agent, placing the epoxy composition in the annulus between the pipe and the walls of the well bore and allowing the epoxy composition to harden.
    Type: Grant
    Filed: April 13, 1998
    Date of Patent: March 2, 1999
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, David D. Onan, Roger S. Cromwell