Patents by Inventor Dustin L. Walker

Dustin L. Walker 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).

  • Chemical enhanced hydrocarbon recovery
    Patent number: 11920084
    Abstract: Compositions and methods for chemical enhanced hydrocarbon recovery that utilize a nonionic surfactant that is a mixture of isomerized C9-11 ethoxylated alcohols.
    Type: Grant
    Filed: August 30, 2022
    Date of Patent: March 5, 2024
    Assignee: Pioneer Natural Resources USA, Inc.
    Inventors: Dustin L. Walker, Joshua W. Brownlow, Kyle D. Scott
  • Injection fluids for stimulating fractured formations
    Patent number: 11834609
    Abstract: Embodiments of the disclosure include compositions and methods that stabilize a injection fluid when exposed to reservoir conditions, reducing formation damage and increasing the amount of hydrocarbon recovered. Specifically, the formulation is a single-phase liquid surfactant package which comprises a surfactant and optionally one or more secondary surfactants. Also provided are methods of using the stabilized injection fluids in stimulation operations.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: December 5, 2023
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Dustin L. Walker, Gayani W. Pinnawala, Nabijan Nizamidin, Varadarajan Dwarakanath, Guo-Qing Tang, Dustin J. Lowry, Tetsuo Art Inouye, Taimur Malik
  • Injection fluids comprising a non-ionic surfactant for treating unconventional formations
    Patent number: 11760921
    Abstract: Embodiments of the disclosure include compositions and methods that stabilize a injection fluid when exposed to reservoir conditions, reducing formation damage and increasing the amount of hydrocarbon recovered. Specifically, the formulation is a single-phase liquid surfactant package which comprises a non-ionic surfactant and optionally one or more secondary surfactants.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: September 19, 2023
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Dustin L. Walker, Gayani W. Pinnawala, Nabijan Nizamidin, Varadarajan Dwarakanath, Guo-Qing Tang, Dustin J. Lowry, Tetsuo Art Inouye, Taimur Malik
  • Injection fluids comprising an anionic surfactant for treating unconventional formations
    Patent number: 11753582
    Abstract: Described herein are compositions and methods that stabilize an injection fluid when exposed to reservoir conditions, reducing formation damage and increasing the amount of hydrocarbon recovered. Specifically, the formulation is a single-phase liquid surfactant package which comprises an anionic surfactant including a hydrophobic tail comprising from 6 to 60 carbon atoms and optionally one or more secondary surfactants.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: September 12, 2023
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Dustin L. Walker, Gayani W. Pinnawala, Nabijan Nizamidin, Varadarajan Dwarakanath, Guo-Qing Tang, Dustin J. Lowry, Tetsuo Art Inouye, Taimur Malik
  • INJECTION FLUIDS COMPRISING AN ANIONIC SURFACTANT FOR TREATING UNCONVENTIONAL FORMATIONS
    Publication number: 20210095184
    Abstract: Embodiments of the disclosure include compositions and methods that stabilize a injection fluid when exposed to reservoir conditions, reducing formation damage and increasing the amount of hydrocarbon recovered. Specifically, the formulation is a single-phase liquid surfactant package which comprises an anionic surfactant and optionally one or more secondary surfactants.
    Type: Application
    Filed: July 31, 2018
    Publication date: April 1, 2021
    Inventors: Dustin L. WALKER, Gayani PINNAWALA ARACHCHILAGE, Nabi NIZAMIDIN, Varadarajan DWARAKANATH, Guo-Qing TANG, Dustin J. LOWRY, Tetsuo Art INOUYE, Taimur MALIK
  • INJECTION FLUIDS FOR STIMULATING FRACTURED FORMATIONS
    Publication number: 20200317993
    Abstract: Embodiments of the disclosure include compositions and methods that stabilize a injection fluid when exposed to reservoir conditions, reducing formation damage and increasing the amount of hydrocarbon recovered. Specifically, the formulation is a single-phase liquid surfactant package which comprises a surfactant and optionally one or more secondary surfactants. Also provided are methods of using the stabilized injection fluids in stimulation operations.
    Type: Application
    Filed: July 31, 2018
    Publication date: October 8, 2020
    Inventors: Dustin L. WALKER, Gayani PINNAWALA ARACHCHILAGE, Nabi NIZAMIDIN, Varadarajan DWARAKANATH, Guo-Qing TANG, Dustin J. LOWRY, Tetsuo Art INOUYE, Taimur MALIK
  • INJECTION FLUIDS COMPRISING A NON-IONIC SURFACTANT FOR TREATING UNCONVENTIONAL FORMATIONS
    Publication number: 20200317992
    Abstract: Embodiments of the disclosure include compositions and methods that stabilize a injection fluid when exposed to reservoir conditions, reducing formation damage and increasing the amount of hydrocarbon recovered. Specifically, the formulation is a single-phase liquid surfactant package which comprises a non-ionic surfactant and optionally one or more secondary surfactants.
    Type: Application
    Filed: July 31, 2018
    Publication date: October 8, 2020
    Inventors: Dustin L. WALKER, Gayani PINNAWALA ARACHCHILAGE, Nabi NIZAMIDIN, Varadarajan DWARAKANATH, Guo-Qing TANG, Dustin J. LOWRY, Tetsuo Art INOUYE, Taimur MALIK
  • Portable apparatus and methods for analyzing injection fluids
    Patent number: 10436693
    Abstract: Provided herein are portable apparatus as well as methods of analyzing an injection fluid using these portable apparatus. In some embodiments, the injection fluid can contain a polymer, but a polymer is not necessary. For example, the portable apparatus and methods may be used to determine viscosity, long term injectivity, filter ratio, or any combination thereof of the injection fluid.
    Type: Grant
    Filed: July 27, 2017
    Date of Patent: October 8, 2019
    Assignee: Chevron U.S.A. Inc.
    Inventors: Varadarajan Dwarakanath, Dustin L. Walker, David R. Espinosa, Dennis A. Alexis, Harold C. Linnemeyer, Marlon Solano
  • Portable apparatus and methods for analyzing injection fluids
    Patent number: 10168265
    Abstract: Provided herein are portable apparatus as well as methods of analyzing an injection fluid using these portable apparatus. In some embodiments, the injection fluid can contain a polymer, but a polymer is not necessary. For example, the portable apparatus and methods may be used to determine viscosity, long term injectivity, filter ratio, or any combination thereof of the injection fluid.
    Type: Grant
    Filed: June 1, 2018
    Date of Patent: January 1, 2019
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Varadarajan Dwarakanath, Dustin L. Walker, David R. Espinosa, Dennis A. Alexis, Harold C. Linnemeyer, Marlon Solano
  • PORTABLE APPARATUS AND METHODS FOR ANALYZING INJECTION FLUIDS
    Publication number: 20180275036
    Abstract: Provided herein are portable apparatus as well as methods of analyzing an injection fluid using these portable apparatus. In some embodiments, the injection fluid can contain a polymer, but a polymer is not necessary. For example, the portable apparatus and methods may be used to determine viscosity, long term injectivity, filter ratio, or any combination thereof of the injection fluid.
    Type: Application
    Filed: June 1, 2018
    Publication date: September 27, 2018
    Inventors: Varadarajan Dwarakanath, Dustin L. Walker, David R. Espinosa, Dennis A. Alexis, Harold C. Linnemeyer, Marlon Solano
  • PORTABLE APPARATUS AND METHODS FOR ANALYZING INJECTION FLUIDS
    Publication number: 20180031462
    Abstract: Provided herein are portable apparatus as well as methods of analyzing an injection fluid using these portable apparatus. In some embodiments, the injection fluid can contain a polymer, but a polymer is not necessary. For example, the portable apparatus and methods may be used to determine viscosity, long term injectivity, filter ratio, or any combination thereof of the injection fluid.
    Type: Application
    Filed: July 27, 2017
    Publication date: February 1, 2018
    Inventors: Varadarajan Dwarakanath, Dustin L. Walker, David R. Espinosa, Dennis A. Alexis, Harold C. Linnemeyer, Marlon Solano
  • Systems and methods for inline chemical injection for dump flood water injectors
    Patent number: 9810049
    Abstract: The present disclosure provides techniques for inline injection of water and chemicals for a dump flood. The techniques include collecting water from a source reservoir into a water collection zone of an adjacent water injection well, and injecting a chemical solution into the water injection well. The water and the chemical solution are then mixed downhole in a mixer, such as a static mixer. The mixed injection fluid is then directly injected into an adjacent target reservoir.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: November 7, 2017
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Robert Matthew Dean, Varadarajan Dwarakanath, Taimur Malik, Will Sherman Slaughter, Dustin L. Walker
  • SYSTEMS AND METHODS FOR INLINE CHEMICAL INJECTION FOR DUMP FLOOD WATER INJECTORS
    Publication number: 20150376998
    Abstract: The present disclosure provides techniques for inline injection of water and chemicals for a dump flood. The techniques include collecting water from a source reservoir into a water collection zone of an adjacent water injection well, and injecting a chemical solution into the water injection well. The water and the chemical solution are then mixed downhole in a mixer, such as a static mixer. The mixed injection fluid is then directly injected into an adjacent target reservoir.
    Type: Application
    Filed: June 25, 2015
    Publication date: December 31, 2015
    Applicant: Chevron U.S.A. Inc.
    Inventors: Robert Matthew Dean, Varadarjan Dwarakanath, Taimur Malik, Will Sherman Slaughter, Dustin L. Walker
  • ALKALI POLYMER SURFACTANT SANDWICH
    Publication number: 20140262275
    Abstract: Aspects of the invention relate to methods for enhancing the amount of oil recovered from subterranean reservoirs or reducing the amount of surfactant needed. The method includes injecting a first alkali-polymer slug through a wellbore into a reservoir, followed by injecting a alkali-polymer-surfactant slug through the wellbore into the reservoir, and then injecting a second alkali-polymer slug through the wellbore into the reservoir.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: Chevron U.S.A. Inc.
    Inventors: Robert Matthew Dean, Dustin L. Walker, Will S. Slaughter, Taimur Malik, Varadarajan Dwarakanath