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).

  • 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: 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
  • 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
  • Publication number: 20220033706
    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 inverted polymer solutions by inverting these LP compositions in an aqueous fluid. The resulting inverted 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 inverted polymer solutions in oil and gas operations, including enhanced oil recovery.
    Type: Application
    Filed: August 6, 2021
    Publication date: February 3, 2022
    Inventors: Do Hoon Kim, Dennis Arun Alexis, Varadarajan Dwarakanath, David Espinosa, Taimur Malik, Logan Jackson, Tom Lynch, Ronald Robinson, Frances Fournier, Hong Yang, Sukhjit Aujla
  • Patent number: 11084973
    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 inverted polymer solutions by inverting these LP compositions in an aqueous fluid. The resulting inverted 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 inverted polymer solutions in oil and gas operations, including enhanced oil recovery.
    Type: Grant
    Filed: April 17, 2020
    Date of Patent: August 10, 2021
    Assignee: Chevron U.S.A. Inc.
    Inventors: Do Hoon Kim, Dennis Arun Alexis, Varadarajan Dwarakanath, David Espinosa, Taimur Malik, Logan Jackson, Tom Lynch, Ronald Robinson, Frances Fournier, Hong Yang, Sukhjit Aujla
  • Publication number: 20210179930
    Abstract: Disclosed herein are methods and composition for breaking foam, emulsions, or any combination thereof.
    Type: Application
    Filed: December 14, 2020
    Publication date: June 17, 2021
    Inventors: Gayani W. PINNAWALA, Sujeewa S. PALAYANGODA, Varadarajan DWARAKANATH, Mohamad SALMAN, Mohsen S. TAGAVIFAR
  • 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
  • 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
  • Publication number: 20210002444
    Abstract: Disclosed are foam precursor compositions, foamed compositions, and methods of using these foamed compositions for the stimulation of unconventional reservoirs.
    Type: Application
    Filed: July 7, 2020
    Publication date: January 7, 2021
    Inventors: Varadarajan DWARAKANATH, Taimur MALIK, Lin ZOU, Jimin Daniel ZHOU, Nabijan NIZAMIDIN, Gregory A. WINSLOW, Reza BANKI, Mohamad SALMAN
  • 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
  • Patent number: 10851629
    Abstract: Additional oil recovery is obtained from a reservoir with a composition comprising at least a coupling solvent typically employed in waterborne coating compositions. Provided herein are embodiments of methods of recovering hydrocarbons using at least one coupling solvent, such as an oxygenated coupling solvent. The coupling solvent increases the mutual solubility with water at the injection temperature to facilitate the mixing and injection, particularly with an optional co-solvent. The coupling solvent helps mitigate formation plugging and improve performance when injected into a formation, as the solvent mixture moves from being miscible in the injection field water to being miscible in the reservoir oil, mobilizing the reservoir oil to increase oil recovery.
    Type: Grant
    Filed: May 24, 2019
    Date of Patent: December 1, 2020
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Varadarajan Dwarakanath, Robert G. Shong, Gregory A. Winslow, Taimur Malik, Marlon Solano
  • Publication number: 20200347285
    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 inverted polymer solutions by inverting these LP compositions in an aqueous fluid. The resulting inverted 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 inverted polymer solutions in oil and gas operations, including enhanced oil recovery.
    Type: Application
    Filed: April 17, 2020
    Publication date: November 5, 2020
    Inventors: Do Hoon Kim, Dennis Arun Alexis, Varadarajan Dwarakanath, David Espinosa, Taimur Malik, Logan Jackson, Tom Lynch, Ronald Robinson, Fraces Fournier, Hong Yang, Sukhjit Aujila
  • Patent number: 10822539
    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 inverted polymer solutions by inverting these LP compositions in an aqueous fluid. The resulting inverted 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 inverted polymer solutions in oil and gas operations, including enhanced oil recovery.
    Type: Grant
    Filed: December 10, 2019
    Date of Patent: November 3, 2020
    Assignee: Chevron U.S.A. Inc.
    Inventors: Do Hoon Kim, Dennis Arun Alexis, Varadarajan Dwarakanath, David Espinosa, Taimur Malik, Logan Jackson, Tom Lynch, Ronald Robinson, Frances Fournier, Hong Yang, Sukhjit Aujla