Patents by Inventor Duy T. Nguyen

Duy T. Nguyen 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).

  • Publication number: 20200392398
    Abstract: Surfactants are imbibed into Halloysite nanotubes (HNT) and the imbibed nanotubes are coated with wax on the nanotube outer surface. The wax layer prevents the surfactant from being disgorged from the HNT lumen until a triggering condition exists. Triggering conditions include contact with oil, which dissolves the wax; or exposure to temperatures above a melt transition of the wax, which causes the wax to melt. Upon exposure to a triggering condition, at least some of the imbibed surfactants are disgorged from the HNT and into the surrounding environment. The disgorged surfactants provide a conventional effect of reducing interfacial tension and changing reservoir rock wettability to enhance oil recovery. A range of surfactants and waxes are usefully employed in the compositions and methods described herein.
    Type: Application
    Filed: June 15, 2020
    Publication date: December 17, 2020
    Inventors: Duy T. Nguyen, Vijay Thomas John
  • Patent number: 10767104
    Abstract: Disclosed herein are compositions and methods for increasing recovery of hydrocarbon compounds from hydrocarbon-containing subterranean fractured rock formations. Novel emulsions and fracturing fluids are provided. The fracturing fluids convert oil-wet rocks to water-wet, yet exhibit a low tendency of composition components to sorb to the rock. The fracturing fluids do not cause formation of emulsions with hydrocarbon compounds within the subterranean fractured rock formations.
    Type: Grant
    Filed: June 11, 2018
    Date of Patent: September 8, 2020
    Assignee: Ecolab USA Inc.
    Inventors: Linh Do, Brian Mueller, Duy T. Nguyen
  • Patent number: 10717875
    Abstract: Provided herein are compositions useful as ink or coatings which contain novel dispersants that are capable of dispersing pigments which are traditionally difficult to disperse while maintaining acceptable levels of viscosity. Use of dispersants as taught herein enables the preparation of a wide variety of inks and coatings having high pigment loading and existing within a conventionally-useful viscosity range.
    Type: Grant
    Filed: December 23, 2016
    Date of Patent: July 21, 2020
    Assignee: HUNTSMAN Petrochemical LLC
    Inventors: Duy T Nguyen, Howard P Klein
  • Patent number: 10647907
    Abstract: Compositions and methods for increasing recovery, or flowback, of hydrocarbon compounds from hydrocarbon-containing subterranean reservoirs. The compositions include a dialkyl dimethyl ammonium surfactant, an amphoteric surfactant, and a solvent. The concentrated compositions are storage stable and easily diluted with a water source such as produced water to form injectates suitable for injecting into one or more hydrocarbon-bearing subterranean reservoirs. The injectates convert oil-wet rocks to water-wet but do not cause formation of emulsions with hydrocarbon compounds within the subterranean environment. Injection of the injectates into a reservoir results in an increase in the yield of hydrocarbons recovered, in particular from low permeability, low porosity reservoirs such as those formed by or encountered in hydraulic fracturing and/or in certain geographic locations.
    Type: Grant
    Filed: July 3, 2018
    Date of Patent: May 12, 2020
    Assignee: Ecolab USA Inc.
    Inventors: Duy T. Nguyen, Tzu-Ping Hsu
  • Publication number: 20200131895
    Abstract: Disclosed herein are ether amine additives for use in oil recovery such as steam-assisted gravity drainage and cyclic steam stimulation, as well as surface mining of bitumen. Methods of oil recovery using the ether amine additives are described. The ether amine additives are injected with steam into a subterranean oil reservoir such as oil tar sands to improve recovery of oils such as bitumen and/or heavy oil, or used to wash surface-mined rock to assist in oil extraction therefrom. The ether amine additives may be added to steam in steam-assisted oil recovery methods such as cyclic steam stimulation and steam-assisted gravity drainage. Condensates of the additives in steam exhibit very low advancing and receding contact angles and low interfacial tensions at low concentrations of the additives.
    Type: Application
    Filed: October 17, 2019
    Publication date: April 30, 2020
    Inventors: Duy T. Nguyen, David Francis Myers, Tyler D. Boyd
  • Patent number: 10407611
    Abstract: The present invention generally relates to methods for enhancing production and transportation of heavy and extra-heavy crude oil and for reducing the growth of asphaltene flocculants or hindering their formation, the methods comprising contacting an oil-soluble composition that comprises polyetheramines, tallow amines, tallow diamines, alkylphenol-formaldehyde resins, reaction products of alpha-olefin, maleic anhydride and pentaerythritol, or a combination thereof, with the heavy or extra-heavy crude oil.
    Type: Grant
    Filed: January 6, 2017
    Date of Patent: September 10, 2019
    Assignee: Ecolab USA Inc.
    Inventors: Duy T. Nguyen, John J. Ibagon, Vittoria Balsamo De Hernandez, Tyler D. Boyd, Joseph Paul Bailey
  • Patent number: 10400157
    Abstract: A composition comprising an alcohol ether sulfonate and a quaternary ammonium salt is provided for use in methods of increasing recovery of crude oil from a subterranean hydrocarbon-containing formation.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: September 3, 2019
    Assignee: Ecolab USA Inc.
    Inventors: Duy T. Nguyen, Brian L. Mueller
  • Publication number: 20190223434
    Abstract: Methods for removing biofilm or preventing biofilm formation from surfaces are provided, the methods comprising applying compositions to the surface to remove the biofilm or inhibit its formation, the compositions comprising polymers derived from alkyl polyglucosides functionalized with cationic side chains.
    Type: Application
    Filed: January 18, 2019
    Publication date: July 25, 2019
    Inventors: Ramakrishnan Balasubramanian, Ian Alexander Richardson, Duy T. Nguyen
  • Publication number: 20190010381
    Abstract: Disclosed herein are compositions and methods for increasing recovery, or flowback, of hydrocarbon compounds from hydrocarbon-containing subterranean reservoirs. The compositions include a dialkyl dimethyl ammonium surfactant, an amphoteric surfactant, and a solvent. The concentrated compositions are storage stable and easily diluted with a water source such as produced water to form injectates suitable for injecting into one or more hydrocarbon-bearing subterranean reservoirs. The injectates convert oil-wet rocks to water-wet but do not cause formation of emulsions with hydrocarbon compounds within the subterranean environment. Injection of the injectates into a reservoir results in an increase in the yield of hydrocarbons recovered, in particular from low permeability, low porosity reservoirs such as those formed by or encountered in hydraulic fracturing and/or in certain geographic locations.
    Type: Application
    Filed: July 3, 2018
    Publication date: January 10, 2019
    Inventors: Duy T. Nguyen, Tzu-Ping Hsu
  • Publication number: 20180312745
    Abstract: Disclosed herein are compositions and methods for increasing recovery of hydrocarbon compounds from hydrocarbon-containing subterranean fractured rock formations. Novel emulsions and fracturing fluids are provided. The fracturing fluids convert oil-wet rocks to water-wet, yet exhibit a low tendency of composition components to sorb to the rock. The fracturing fluids do not cause formation of emulsions with hydrocarbon compounds within the subterranean fractured rock formations.
    Type: Application
    Filed: June 11, 2018
    Publication date: November 1, 2018
    Inventors: Linh Do, Brian Mueller, Duy T. Nguyen
  • Patent number: 10041007
    Abstract: Disclosed and claimed is a microemulsion-based demulsifier composition and a method of demulsifying an emulsion comprising hydrocarbon and water. The demulsifier composition includes (i) an oil-like phase comprising at least one nonionic surfactant having a hydrophilic-lipophilic balance (HLB) of less than about 9; (ii) a coupling agent capable of stabilizing the demulsifier composition; (iii) at least one water-soluble or dispersible nonionic surfactant that is different from the at least one nonionic surfactant in the oil-like phase; (iv) at least one additional surfactant selected from anionic, cationic, amphoteric, and combinations thereof; (v) at least one nonionic demulsifier; and (vi) water.
    Type: Grant
    Filed: April 25, 2016
    Date of Patent: August 7, 2018
    Assignee: Ecolab USA Inc.
    Inventor: Duy T. Nguyen
  • Publication number: 20180100097
    Abstract: A composition comprising an alcohol ether sulfonate and a quaternary ammonium salt is provided for use in methods of increasing recovery of crude oil from a subterranean hydrocarbon-containing formation.
    Type: Application
    Filed: December 12, 2017
    Publication date: April 12, 2018
    Inventors: Duy T. Nguyen, Brian L. Mueller
  • Patent number: 9926486
    Abstract: A composition comprising an alcohol ether sulfonate and a quaternary ammonium salt is provided for use in methods of increasing recovery of crude oil from a subterranean hydrocarbon-containing formation.
    Type: Grant
    Filed: March 31, 2014
    Date of Patent: March 27, 2018
    Assignee: Ecolab USA Inc.
    Inventors: Duy T. Nguyen, Brian L. Mueller
  • Patent number: 9862882
    Abstract: A composition comprising an alcohol ether sulfonate is provided for use in methods of removing a fluid from a subterranean hydrocarbon-containing formation.
    Type: Grant
    Filed: March 1, 2016
    Date of Patent: January 9, 2018
    Assignee: Ecolab USA Inc.
    Inventors: Fenfen Huang, Duy T. Nguyen
  • Publication number: 20170369759
    Abstract: Disclosed herein are compositions and methods for increasing recovery, or flowback, of hydrocarbon compounds from hydrocarbon-containing subterranean fractured rock formations (tight shale reservoirs). The flowback compositions include an anionic dimer surfactant, an anionic monomer surfactant, and a demulsifier. The flowback compositions convert oil-wet rocks to water-wet, yet exhibit a low tendency of composition components to sorb to the rock. The flowback compositions do not cause formation of emulsions with hydrocarbon compounds within the subterranean fractured rock formations. The flowback composition are useful for increasing the yield of hydrocarbons recovered from tight shale reservoirs.
    Type: Application
    Filed: June 26, 2017
    Publication date: December 28, 2017
    Inventors: Duy T. Nguyen, Jenny L. Phan
  • Publication number: 20170198204
    Abstract: The present invention generally relates to methods for enhancing production and transportation of heavy and extra-heavy crude oil and for reducing the growth of asphaltene flocculants or hindering their formation, the methods comprising contacting an oil-soluble composition that comprises polyetheramines, tallow amines, tallow diamines, alkylphenol-formaldehyde resins, reaction products of alpha-olefin, maleic anhydride and pentaerythritol, or a combination thereof, with the heavy or extra-heavy crude oil.
    Type: Application
    Filed: January 6, 2017
    Publication date: July 13, 2017
    Inventors: Duy T. Nguyen, John J. Ibagon, Vittoria Balsamo De Hernandez, Tyler D. Boyd, Joseph Paul Bailey
  • Patent number: 9701888
    Abstract: Disclosed and claimed is a microemulsion flowback aid composition and a method of enhancing recovery of oil or gas during fracturing or stimulation processes. The microemulsion flowback aid composition includes (i) an oil-like phase comprising at least one nonionic surfactant having a hydrophilic-lipophilic balance (HLB) of less than about 9; (ii) a coupling agent capable of stabilizing the microemulsion flowback aid composition; (iii) at least one water-soluble or dispersible nonionic surfactant that is different from the at least one nonionic surfactant in the oil-like phase; (iv) at least one additional surfactant selected from anionic, cationic, amphoteric, and combinations thereof; and (v) water.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: July 11, 2017
    Assignee: Ecolab USA Inc.
    Inventor: Duy T. Nguyen
  • Patent number: 9663705
    Abstract: Disclosed and claimed is a method of demulsifying an emulsion comprising water and oil. The method comprises adding an effective amount of a composition comprising at least one substantially fully quaternized ammonium adduct of polyephalohydrin that has a molecular weight from about 500 Da to about 2,500 Da.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: May 30, 2017
    Assignee: Nalco Company
    Inventor: Duy T. Nguyen
  • Patent number: 9631133
    Abstract: This invention relates generally to novel foamer compositions for treatment of oil and gas wells to enhance production. The invention provides a method of foaming a fluid. The method includes introducing into the fluid a foam-forming amount of a composition comprising at least one long chain fatty acid and at least one organic solvent. An example of the long chain fatty acid is tall oil fatty acid and an example of the organic solvent is ethyleneglycol monobutyl ether.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: April 25, 2017
    Assignee: Nalco Company
    Inventor: Duy T. Nguyen
  • Publication number: 20170101535
    Abstract: Provided herein are compositions useful as ink or coatings which contain novel dispersants that are capable of dispersing pigments which are traditionally difficult to disperse while maintaining acceptable levels of viscosity. Use of dispersants as taught herein enables the preparation of a wide variety of inks and coatings having high pigment loading and existing within a conventionally-useful viscosity range.
    Type: Application
    Filed: December 23, 2016
    Publication date: April 13, 2017
    Inventors: Duy T. Nguyen, Howard P. Klein