Patents by Inventor Dennis A. Alexis

Dennis A. Alexis 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: 20240067865
    Abstract: Embodiments of treating fluid comprising hydrocarbons, water, and polymer being produced from a hydrocarbon-bearing formation are provided. One embodiment comprises adding a concentration of a viscosity reducer to the fluid to degrade the polymer present in the fluid and adding a concentration of a neutralizer to the fluid to neutralize the viscosity reducer in the fluid. The addition of the concentration of the viscosity reducer is in a sufficient quantity to allow for complete chemical degradation of the polymer prior to the addition of the concentration of the neutralizer in the fluid such that excess viscosity reducer is present in the fluid. The addition of the concentration of the neutralizer is sufficiently upstream of any surface fluid processing equipment to allow for complete neutralization of the excess viscosity reducer such that excess neutralizer is present in the fluid prior to the fluid reaching any of the surface fluid processing equipment.
    Type: Application
    Filed: October 27, 2023
    Publication date: February 29, 2024
    Inventors: Sumitra SUBRAHMANYAN, Gayani W. PINNAWALA, Sophany THACH, Gregory A. WINSLOW, Dennis A. ALEXIS, Harold C. LINNEMEYER, Timothy P. THERIOT, Les Leszek JACKOWSKI, Francesca CIBOTTI
  • Patent number: 11884879
    Abstract: Disclosed are compositions and methods for use in oil and gas operations.
    Type: Grant
    Filed: February 14, 2022
    Date of Patent: January 30, 2024
    Assignees: CHEVRON U.S.A. INC., CHEVRON ORONITE COMPANY LLC
    Inventors: Dennis A. Alexis, Gayani Pinnawala Arachchilage, Varadarajan Dwarakanath, Do Hoon Kim, Taimur Malik, Gregory A. Winslow, Aaron Wilhelm
  • Patent number: 11834606
    Abstract: Embodiments of treating fluid comprising hydrocarbons, water, and polymer being produced from a hydrocarbon-bearing formation are provided. One embodiment comprises adding a concentration of a viscosity reducer to the fluid to degrade the polymer present in the fluid and adding a concentration of a neutralizer to the fluid to neutralize the viscosity reducer in the fluid. The addition of the concentration of the viscosity reducer is in a sufficient quantity to allow for complete chemical degradation of the polymer prior to the addition of the concentration of the neutralizer in the fluid such that excess viscosity reducer is present in the fluid. The addition of the concentration of the neutralizer is sufficiently upstream of any surface fluid processing equipment to allow for complete neutralization of the excess viscosity reducer such that excess neutralizer is present in the fluid prior to the fluid reaching any of the surface fluid processing equipment.
    Type: Grant
    Filed: January 21, 2022
    Date of Patent: December 5, 2023
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Sumitra Subrahmanyan, Gayani W. Pinnawala, Sophany Thach, Gregory A. Winslow, Dennis A. Alexis, Harold C. Linnemeyer, Timothy P. Theriot, Les Leszek Jackowski, Francesca Cibotti
  • Publication number: 20230383636
    Abstract: Described are compositions and methods for use in oil and gas operations. The methods can decrease pressure drop along a lateral segment of a wellbore in an unconventional subterranean formation.
    Type: Application
    Filed: May 31, 2023
    Publication date: November 30, 2023
    Inventors: Gojko Matovic, Nabijan Nizamidin, Michael Ogechukwuka Unomah, Do Hoon Kim, Varadarajan Dwarakanath, Taimur Malik, Gayani W. Pinnawala, Dennis A. Alexis, Samuel Wei-en Lau
  • Patent number: 11739254
    Abstract: Disclosed are compositions and methods for use in oil and gas operations.
    Type: Grant
    Filed: May 17, 2021
    Date of Patent: August 29, 2023
    Assignees: CHEVRON U.S.A. INC., CHEVRON ORONITE COMPANY LLC
    Inventors: Dennis A. Alexis, Gayani Pinnawala Arachchilage, Varadarajan Dwarakanath, Do Hoon Kim, Taimur Malik, Gregory A. Winslow, Aaron Wilhelm
  • Publication number: 20220372363
    Abstract: Disclosed are compositions and methods for use in oil and gas operations.
    Type: Application
    Filed: February 14, 2022
    Publication date: November 24, 2022
    Inventors: Dennis A. Alexis, Gayani Pinnawala Arachchilage, Varadarajan Dwarakanath, Do Hoon Kim, Taimur Malik, Gregory A. Winslow, Aaron Wilhelm
  • Publication number: 20220145157
    Abstract: Embodiments of treating fluid comprising hydrocarbons, water, and polymer being produced from a hydrocarbon-bearing formation are provided. One embodiment comprises adding a concentration of a viscosity reducer to the fluid to degrade the polymer present in the fluid and adding a concentration of a neutralizer to the fluid to neutralize the viscosity reducer in the fluid. The addition of the concentration of the viscosity reducer is in a sufficient quantity to allow for complete chemical degradation of the polymer prior to the addition of the concentration of the neutralizer in the fluid such that excess viscosity reducer is present in the fluid. The addition of the concentration of the neutralizer is sufficiently upstream of any surface fluid processing equipment to allow for complete neutralization of the excess viscosity reducer such that excess neutralizer is present in the fluid prior to the fluid reaching any of the surface fluid processing equipment.
    Type: Application
    Filed: January 21, 2022
    Publication date: May 12, 2022
    Inventors: Sumitra Subrahmanyan, Gayani W. Pinnawala, Sophany Thach, Gregory A. Winslow, Dennis A. Alexis, Harold C. Linnemeyer, Timothy P. Theriot, Les Leszek Jackowski, Francesca Cibotti
  • Publication number: 20220098470
    Abstract: Disclosed are compositions and methods for use in oil and gas operations.
    Type: Application
    Filed: May 17, 2021
    Publication date: March 31, 2022
    Inventors: Dennis A. Alexis, Gayani Pinnawala Arachchilage, Varadarajan Dwarakanath, Do Hoon Kim, Taimur Malik, Gregory A. Winslow, Aaron Wilhelm
  • Patent number: 11261300
    Abstract: Provided herein are liquid polymer (LP) compositions comprising a synthetic (co)polymer (e.g., an acrylamide (co)polymer), as well as methods for preparing aqueous polymer solutions by combining these LP compositions with an aqueous fluid. The resulting aqueous polymer solutions can have a concentration of a synthetic (co)polymer (e.g., an acrylamide (co)polymer) of from 50 to 15,000 ppm, and a filter ratio of 1.5 or less at 15 psi using a 1.2 ?m filter. Also provided are methods of using these aqueous polymer solutions in oil and gas operations, including enhanced oil recovery.
    Type: Grant
    Filed: December 14, 2020
    Date of Patent: March 1, 2022
    Assignee: Chevron U.S.A. Inc.
    Inventors: Do Hoon Kim, Dennis A. Alexis, Varadarajan Dwarakanath, David R. Espinosa, Taimur Malik, Peter G. New, Adam C. Jackson, Christopher Michael Niemi
  • Patent number: 11248160
    Abstract: Disclosed are compositions and methods for use in oil and gas operations.
    Type: Grant
    Filed: January 30, 2019
    Date of Patent: February 15, 2022
    Assignees: Chevron U.S.A. Inc., Chevron Oronite Company LLC
    Inventors: Dennis A. Alexis, Gayani Pinnawala Arachchilage, Varadarajan Dwarakanath, Do Hoon Kim, Taimur Malik, Gregory A. Winslow, Aaron Wilhelm
  • Publication number: 20210171721
    Abstract: Provided herein are liquid polymer (LP) compositions comprising a synthetic (co)polymer (e.g., an acrylamide (co)polymer), as well as methods for preparing aqueous polymer solutions by combining these LP compositions with an aqueous fluid. The resulting aqueous polymer solutions can have a concentration of a synthetic (co)polymer (e.g., an acrylamide (co)polymer) of from 50 to 15,000 ppm, and a filter ratio of 1.5 or less at 15 psi using a 1.2 ?m filter. Also provided are methods of using these aqueous polymer solutions in oil and gas operations, including enhanced oil recovery.
    Type: Application
    Filed: December 14, 2020
    Publication date: June 10, 2021
    Inventors: Do Hoon Kim, Dennis A. Alexis, Varadarajan Dwarakanath, David R. Espinosa, Taimur Malik, Peter G. New, Adam C. Jackson, Christopher Michael Niemi
  • Patent number: 11008502
    Abstract: Disclosed are compositions and methods for use in oil and gas operations.
    Type: Grant
    Filed: January 30, 2019
    Date of Patent: May 18, 2021
    Assignees: Chevron U.S.A. Inc., Chevron Oronite Company LLC
    Inventors: Dennis A. Alexis, Gayani Pinnawala Arachchilage, Varadarajan Dwarakanath, Do Hoon Kim, Taimur Malik, Gregory A. Winslow, Aaron Wilhelm
  • Patent number: 10865279
    Abstract: Provided herein are liquid polymer (LP) compositions comprising a synthetic (co)polymer (e.g., an acrylamide (co)polymer), as well as methods for preparing aqueous polymer solutions by combining these LP compositions with an aqueous fluid. The resulting aqueous polymer solutions can have a concentration of a synthetic (co)polymer (e.g., an acrylamide (co)polymer) of from 50 to 15,000 ppm, and a filter ratio of 1.5 or less at 15 psi using a 1.2 ?m filter. Also provided are methods of using these aqueous polymer solutions in oil and gas operations, including enhanced oil recovery.
    Type: Grant
    Filed: June 14, 2019
    Date of Patent: December 15, 2020
    Assignee: Chevron U.S.A. Inc.
    Inventors: Do Hoon Kim, Dennis A. Alexis, Varadarajan Dwarakanath, David R. Espinosa, Taimur Malik, Peter G. New, Adam C. Jackson, Christopher Michael Niemi
  • Publication number: 20190367685
    Abstract: Provided herein are liquid polymer (LP) compositions comprising a synthetic (co)polymer (e.g., an acrylamide (co)polymer), as well as methods for preparing aqueous polymer solutions by combining these LP compositions with an aqueous fluid. The resulting aqueous polymer solutions can have a concentration of a synthetic (co)polymer (e.g., an acrylamide (co)polymer) of from 50 to 15,000 ppm, and a filter ratio of 1.5 or less at 15 psi using a 1.2 ?m filter. Also provided are methods of using these aqueous polymer solutions in oil and gas operations, including enhanced oil recovery.
    Type: Application
    Filed: June 14, 2019
    Publication date: December 5, 2019
    Inventors: Do Hoon Kim, Dennis A. Alexis, Varadarajan Dwarakanath, David R. Espinosa, Taimur Malik, Peter G. New, Adam C. Jackson, Christopher Michael Niemi
  • 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
  • Publication number: 20190233716
    Abstract: Disclosed are compositions and methods for use in oil and gas operations.
    Type: Application
    Filed: January 30, 2019
    Publication date: August 1, 2019
    Inventors: Dennis A. ALEXIS, Gayani PINNAWALA ARACHCHILAGE, Varadarajan DWARAKANATH, Do Hoon KIM, Taimur MALIK, Gregory A. WINSLOW, Aaron WILHELM
  • Publication number: 20190233715
    Abstract: Disclosed are compositions and methods for use in oil and gas operations.
    Type: Application
    Filed: January 30, 2019
    Publication date: August 1, 2019
    Inventors: Dennis A. ALEXIS, Gayani PINNAWALA ARACHCHILAGE, Varadarajan DWARAKANATH, Do Hoon KIM, Taimur MALIK, Gregory A. WINSLOW, Aaron WILHELM
  • Patent number: 10344129
    Abstract: Provided herein are liquid polymer (LP) compositions comprising a synthetic (co)polymer (e.g., an acrylamide (co)polymer), as well as methods for preparing aqueous polymer solutions by combining these LP compositions with an aqueous fluid. The resulting aqueous polymer solutions can have a concentration of a synthetic (co)polymer (e.g., an acrylamide (co)polymer) of from 50 to 15,000 ppm, and a filter ratio of 1.5 or less at 15 psi using a 1.2 ?m filter. Also provided are methods of using these aqueous polymer solutions in oil and gas operations, including enhanced oil recovery.
    Type: Grant
    Filed: December 7, 2017
    Date of Patent: July 9, 2019
    Assignee: Chevron U.S.A. Inc.
    Inventors: Do Hoon Kim, Dennis A. Alexis, Varadarajan Dwarakanath, David R. Espinosa, Taimur Malik, Peter G. New, Adam C. Jackson, Christopher Michael Niemi
  • 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
  • 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