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: 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: 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: 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: 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
  • Publication number: 20220333003
    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: June 29, 2022
    Publication date: October 20, 2022
    Inventors: Nabijan Nizamidin, Gayani W. Pinnawala, Guo-Qing Tang, Varadarajan Dwarakanath, Gregory A. Winslow, Jordan Taylor Isbell, Taimur Malik
  • Publication number: 20220290031
    Abstract: Described herein are aqueous based foams for use in drilling operations. The foams can be used in below bubble point drilling operations to control the migration of reservoir gases (e.g., hydrogen sulfide) to the surface.
    Type: Application
    Filed: August 14, 2020
    Publication date: September 15, 2022
    Inventors: Ruth Ellen HAHN, Varadarajan DWARAKANATH, Kerry SPILKER, Gregory A. WINSLOW, Sophany THACH, Gayani W. PINNAWALA, Christopher GRIFFITH, Harold Charles LINNEMEYER, Robert Neil TROTTER
  • Patent number: 11377586
    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: July 31, 2019
    Date of Patent: July 5, 2022
    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: 11299409
    Abstract: Provided herein are liquid polymer (LP) compositions comprising an acrylamide (co)polymer, as well as methods for preparing inverted polymer solutions by inverting these LP compositions in an aqueous fluid. The resulting inverted polymer solutions can have a concentration of acrylamide (co)polymer of from about 50 to about 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 inverted polymer solutions in dewatering, clarification, flocculation and/or thickening applications, and the like.
    Type: Grant
    Filed: December 7, 2016
    Date of Patent: April 12, 2022
    Assignees: KEMIRA OYJ, CHEVRON U.S.A. INC.
    Inventors: Logan Jackson, Thomas J. Lynch, Ronald Robinson, Frances Fournier, Hong Yang, Sukhjit Aujla, Do Hoon Kim, Dennis Arun Alexis, Varadarajan Dwarakanath, David Espinosa, Taimur Malik
  • 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: 11248159
    Abstract: The present disclosure relates to the use of a multicarboxylate, such as an alkyl alkoxy dicarboxylate, in enhanced oil recovery processes. Embodiments relate to an aqueous stream and the use thereof. The aqueous stream includes a compound having the chemical formula: R1-R2-R3, wherein R1 includes a branched or unbranched, saturated or unsaturated, cyclic or non-cyclic, hydrophobic carbon chain having an oxygen atom linking R1 and R2; R2 includes an alkoxylated chain comprising ethylene oxide, propylene oxide, butylene oxide, or a combination thereof; and R3 includes a branched or unbranched hydrocarbon chain and 2-5 —COOH or —COOM groups wherein M is a monovalent, divalent, or trivalent cation. R3 includes 2-12 carbon atoms.
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: February 15, 2022
    Assignee: Chevron U.S.A. INC.
    Inventors: Robert George Shong, Varadarajan Dwarakanath, Gregory A. Winslow, Sophany Thach
  • 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