Patents by Inventor Varadarajan Dwarakanath

Varadarajan Dwarakanath 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: 11905461
    Abstract: Disclosed are foam precursor compositions, foamed compositions, and methods of using these foamed compositions for the stimulation of unconventional reservoirs.
    Type: Grant
    Filed: July 7, 2020
    Date of Patent: February 20, 2024
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Varadarajan Dwarakanath, Taimur Malik, Lin Zuo, Jimin Daniel Zhou, Nabijan Nizamidin, Gregory A. Winslow, Reza Banki, Mohamad Salman
  • Publication number: 20240052234
    Abstract: Provided herein are compositions comprising borate-acid buffers, as well as methods of using these compositions in oil and gas operations, including enhanced oil recovery (EOR) operations, fracturing operations, stimulation operations, etc.
    Type: Application
    Filed: October 17, 2023
    Publication date: February 15, 2024
    Inventors: Nabijan NIZAMIDIN, Gayani W. PINNAWALA, Guo-Qing TANG, Varadarajan DWARAKANATH, Gregory A. WINSLOW, Jordan Taylor ISBELL, Taimur MALIK
  • Patent number: 11898100
    Abstract: Disclosed herein are methods and composition for breaking foam, emulsions, or any combination thereof.
    Type: Grant
    Filed: December 14, 2020
    Date of Patent: February 13, 2024
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Gayani W. Pinnawala, Sujeewa S. Palayangoda, Varadarajan Dwarakanath, Mohamad Salman, Mohsen S. Tagavifar
  • 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: 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
  • 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
  • Publication number: 20230332037
    Abstract: The present disclosure is directed to polyanionic surfactants, surfactant mixtures, compositions derived thereof, and uses thereof such as in oil and gas operations. Methods of making polyanionic surfactants are also described.
    Type: Application
    Filed: April 26, 2021
    Publication date: October 19, 2023
    Inventors: Gayani W. PINNAWALA, Sujeewa S. PALAYANGODA, Gregory A. WINSLOW, Varadarajan DWARAKANATH
  • Patent number: 11787998
    Abstract: Provided herein are compositions comprising borate-acid buffers, as well as methods of using these compositions in oil and gas operations, including enhanced oil recovery (EOR) operations, fracturing operations, stimulation operations, etc.
    Type: Grant
    Filed: June 29, 2022
    Date of Patent: October 17, 2023
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Nabijan Nizamidin, Gayani W. Pinnawala, Guo-Qing Tang, Varadarajan Dwarakanath, Gregory A. Winslow, Jordan Taylor Isbell, Taimur Malik
  • 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
  • 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
  • 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: 20230257644
    Abstract: The present disclosure is directed to polyanionic surfactants, surfactant mixtures, compositions derived thereof, and uses thereof in hydrocarbon recovery. Methods of making polyanionic surfactants are also described.
    Type: Application
    Filed: April 26, 2021
    Publication date: August 17, 2023
    Inventors: Gayani W. PINNAWALA, Sujeewa S. PALAYANGODA, Gregory A. WINSLOW, Varadarajan DWARAKANATH, Kerry Kennedy SPILKER, Robert George SHONG
  • Publication number: 20230183578
    Abstract: The present disclosure is directed to polyanionic surfactants, surfactant mixtures, compositions derived thereof, and uses thereof in hydrocarbon recovery. Methods of making polyanionic surfactants are also described.
    Type: Application
    Filed: April 26, 2021
    Publication date: June 15, 2023
    Inventors: Gayani W. PINNAWALA, Sujeewa S. PALAYANGODA, Gregory A. WINSLOW, Varadarajan DWARAKANATH, Kerry Kennedy SPILKER, Robert George SHONG
  • Publication number: 20230183577
    Abstract: The present disclosure is directed to polyanionic surfactants, surfactant mixtures, compositions derived thereof, and uses thereof in hydrocarbon recovery. Methods of making polyanionic surfactants are also described.
    Type: Application
    Filed: April 26, 2021
    Publication date: June 15, 2023
    Inventors: Gayani W. PINNAWALA, Sujeewa S. PALAYANGODA, Gregory A. WINSLOW, Varadarajan DWARAKANATH
  • Publication number: 20230167353
    Abstract: The present disclosure is directed to polyanionic surfactants, surfactant mixtures, compositions derived thereof, and uses thereof in hydrocarbon recovery. Methods of making polyanionic surfactants are also described.
    Type: Application
    Filed: April 26, 2021
    Publication date: June 1, 2023
    Inventors: Gayani W. PINNAWALA, Sujeewa S. PALAYANGODA, Gregory A. WINSLOW, Varadarajan DWARAKANATH
  • Publication number: 20230097814
    Abstract: Described herein are surfactant compositions for use in oil and gas operations. The surfactant compositions are stable under harsh conditions, including in formations that exhibit high salinity, high temperature, and/or high H2S concentration. Also provided are methods of using these compositions. Specifically an aqueous composition comprising: (i) a surfactant package, wherein the surfactant package comprises: (a) a surfactant comprising a branched, unbranched, saturated, or unsaturated C6-C32:80(0-65):PO(0-65):EO(0-100)-X having a concentration within the aqueous composition of from 0.05%-5% by weight, based on the total weight of the aqueous composition, wherein there is at least one BO, PO, or EO group, and wherein X comprises a sulfonate, a disulfonate, a carboxylate, a dicarboxylate, a sulfosuccinate, a disulfosuccinate, or hydrogen: and (b) olefin sulfonate and/or a disulfonate; and (ii) water.
    Type: Application
    Filed: January 25, 2021
    Publication date: March 30, 2023
    Inventors: Gayani W. PINNAWALA, Nabijan NIZAMIDIN, Varadarajan DWARAKANATH, Guo-Qing TANG, Aaron WILHELM, Scott P. WEST
  • Publication number: 20220389304
    Abstract: The present disclosure is directed to surfactants (in particular olefin sulfonates), surfactant packages, compositions derived thereof, and uses thereof in hydrocarbon recovery. Methods of making olefin sulfonate surfactants are also described.
    Type: Application
    Filed: October 30, 2020
    Publication date: December 8, 2022
    Applicants: CHEVRON ORONITE COMPANY LLC, CHEVRON U.S.A. INC.
    Inventors: Varadarajan DWARAKANATH, Gayani W. PINNAWALA, Andrew M. THOMAS, Curtis B. CAMPBELL, Andrew M. DAVIDSON, Ping WANG
  • 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: 20220372361
    Abstract: The present disclosure is directed to surfactants (in particular olefin sulfonates), surfactant packages, compositions derived thereof, and uses thereof in hydrocarbon recovery. Methods of making olefin sulfonate surfactants are also described.
    Type: Application
    Filed: October 30, 2020
    Publication date: November 24, 2022
    Applicants: CHEVRON U.S.A. INC., CHEVRON ORONITE COMPANY LLC
    Inventors: Gayani W. PINNAWALA, Varadarajan DWARAKANATH, Andrew M. THOMAS, Curtis B. CAMPBELL, Andrew M. DAVIDSON, Ping WANG
  • Publication number: 20220363979
    Abstract: The present disclosure is directed to surfactants (in particular olefin sulfonates), surfactant packages, compositions derived thereof, and uses thereof in hydrocarbon recovery. Methods of making olefin sulfonate surfactants are also described.
    Type: Application
    Filed: October 30, 2020
    Publication date: November 17, 2022
    Applicants: CHEVRON ORONITE COMPANY LLC, CHEVRON U.S.A. INC.
    Inventors: Andrew M. THOMAS, Curtis B. CAMPBELL, Gayani W. PINNAWALA, Varadarajan DWARAKANATH, Andrew M. DAVIDSON, Ping WANG