Varadarajan J Dwarakanath from 6423 Wister Ln, Houston, TX 77008, age 54

Us Patents

Enhanced Oil Recovery Surfactant Formulation And Method Of Making The Same
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US Patent:

8163678, Apr 24, 2012
Filed:

Oct 29, 2008
Appl. No.:

12/260768
Inventors:

Curtis B. Campbell - Hercules CA, US
Theresa A. Denslow - Concord CA, US
Gabriel Prukop - Katy TX, US
Varadarajan Dwarakanath - Houston TX, US
Adam C. Jackson - League City TX, US
Taimur Malik - Houston TX, US
Tanmay Chaturvedi - Houston TX, US
Assignee:

Chevron U.S.A. Inc. - San Ramon CA
Chevron Oronite Company, LLC - San Ramon CA
International Classification:

C09K 8/524
C09K 8/584
E21B 43/00
E21B 43/22
US Classification:

507263, 507252, 507254, 507256, 507259, 1662701
Abstract:

The present invention is directed to an enhanced oil recovery formulation which comprises:.

Non-Ionic Alkali Polymer Solutions For Enhanced Oil Recovery In A Subterranean Formation
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US Patent:

8573299, Nov 5, 2013
Filed:

Oct 21, 2010
Appl. No.:

12/909631
Inventors:

Varadarajan Dwarakanath - Houston TX, US
Taimur Malik - Houston TX, US
Adam Christopher Jackson - Bakersfield CA, US
Ping Zhao - Katy TX, US
Oya A. Karazincir - Houston TX, US
Sophany Thach - Houston TX, US
Assignee:

Chevron U.S.A. Inc. - San Ramon CA
International Classification:

E21B 43/22
C09K 8/584
US Classification:

1662701, 166 52, 166275, 1663051, 166400, 507266, 507904, 507936
Abstract:

A method for enhancing oil recovery is disclosed. The method includes providing a subsurface reservoir containing hydrocarbons therewithin and a wellbore in fluid communication with the subsurface reservoir. A solution for injection into the reservoir is formed by mixing a composition with at least one non-ionic chemical, at least one polymer, and at least one alkali. The non-ionic chemical can be alcohol alkoxylates such as alkylaryl alkoxy alcohols or alkyl alkoxy alcohols. The solution is solution is clear and aqueous stable when mixed. The solution is injected through the wellbore into the subsurface reservoir.

Method For Enhancing Oil Recovery With An Inproved Oil Recovery Surfactant
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US Patent:

20090151941, Jun 18, 2009
Filed:

Dec 18, 2007
Appl. No.:

11/959151
Inventors:

Varadarajan Dwarakanath - Houston TX, US
Curtis Bay Campbell - Hercules CA, US
Tanmay Chaturvedi - Houston TX, US
Theresa Ann Denslow - Concord CA, US
Adam Jackson - League City TX, US
Taimur Malik - Houston TX, US
Gabriel Prukop - Katy TX, US
Sophany Thach - Houston TX, US
Assignee:

Chevron U.S.A. Inc. - San Ramon CA
International Classification:

E21B 43/22
C09K 8/86
US Classification:

1662701, 507261, 507259
Abstract:

A method for enhancing oil recovery includes the step of providing a subsurface reservoir containing hydrocarbons therewithin. A wellbore is provided in fluid communication with the subsurface reservoir. A surfactant-polymer solution is formed for injection into the reservoir. The surfactant-polymer solution is formed by mixing a composition with at least one surfactant, at least one polymer, and at least one co-solvent or co-surfactant such that the surfactant-polymer solution is clear and aqueous stable. The surfactant-polymer solution is injected through the wellbore into the reservoir. A chaser solution is formed for injection into the reservoir. The chaser solution has an additional predetermined quantity of the co-solvent or co-surfactant. The chaser solution is injected through the injection wellbore into the reservoir to increase the production of hydrocarbons from the reservoir while maintaining the clear and aqueous stability of the surfactant-polymer solution.

Heat Generating System For Enhancing Oil Recovery
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US Patent:

20120152536, Jun 21, 2012
Filed:

Dec 17, 2010
Appl. No.:

12/971785
Inventors:

Gregory Winslow - Houston TX, US
Gabriel Prukop - Katy TX, US
Varadarajan Dwarakanath - Houston TX, US
Assignee:

Chevron U.S.A. Inc. - San Ramon CA
International Classification:

E21B 43/24
C09K 8/588
C09K 8/584
US Classification:

1662721, 507200, 507269, 507266, 507264, 507259, 507256, 507260, 507225, 507226
Abstract:

The instant invention pertains to a composition which may be useful for enhancing oil recovery. The composition typically comprises the reaction mixture of at least (a) two or more compounds capable of generating at least about 20 kcal to about 150 kcal per mole when contacted; (b) one or more suitable surfactants or one or more suitable polymers or a mixture thereof; and (c) oil. The invention also pertains to a method for enhancing oil recovery wherein a suitable system is injected through a wellbore into a reservoir to enhance mobility of oil.

Method Of Preventing Scale Formation During Enhanced Oil Recovery
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US Patent:

20120322699, Dec 20, 2012
Filed:

Feb 14, 2012
Appl. No.:

13/396114
Inventors:

Oya A. Karazincir - Houston TX, US
Sophany Thach - Houston TX, US
Wei Wei - Sugar Land TX, US
Gabriel Prukop - Katy TX, US
Taimur Malik - Houston TX, US
Varadarajan Dwarakanath - Houston TX, US
Assignee:

Chevron U.S.A. Inc. - San Ramon CA
International Classification:

C09K 8/52
US Classification:

507227, 507241, 507237
Abstract:

A method for preventing scale formation during an alkaline hydrocarbon recovery process is disclosed. An aqueous solution (e.g., recovered sea water, water produced from the subterranean reservoir, or a combination thereof) having a concentration of metal cations (e.g., calcium, magnesium) is provided. A stoichiometric amount of an organic complexing agent relative to the concentration of metal cations is introduced into the aqueous solution such that the organic complexing agent forms aqueous soluble cation-ligand complexes with the metal cations. At least one alkaline is introduced into the aqueous solution to form an injection fluid having a pH value of at least 10. The cation-ligand complexes remain soluble in the injection fluid such that scale formation is prevented when the injection fluid is injected into a subterranean reservoir.

Method Of Manufacture Of Guerbet Alcohols For Making Surfactants Used In Petroleum Industry Operations
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US Patent:

20130068457, Mar 21, 2013
Filed:

Sep 15, 2011
Appl. No.:

13/233406
Inventors:

Sophany Thach - Houston TX, US
Robert Shong - Houston TX, US
Varadarajan Dwarakanath - Houston TX, US
Gregory Winslow - Houston TX, US
Assignee:

Chevron U.S.A. Inc. - San Ramon CA
International Classification:

C07C 303/24
C07C 303/28
E21B 43/22
C07C 41/03
US Classification:

1662701, 568618, 558 41, 558 44, 558 34
Abstract:

A method is disclosed for manufacturing surfactants for utilization in petroleum industry operations. The method comprises providing a bio-lipid. The bio-lipid can include one or more medium-chain or long-chain fatty acids, such as Lauric acid, Myristic acid, Palmitic acid, Stearic acid, Palmitoleic acid, Oleic acid, Ricinoleic acid, Vaccenic acid, Linoleic acid, Alpha-Linoleic acid, or Gamma-Linolenic acid. Fatty acid alkyl esters are produced by reacting the bio-lipid with a low-molecular weight alcohol. The fatty acid alkyl esters are reduced to a fatty alcohol. The fatty alcohol is dimerized to form a Guerbet alcohol, which is a precursor to producing surfactant for utilization in a petroleum industry operation, such as an enhanced oil recovery process.

Apparatus And Method For Measuring Viscosity Of A Fluid
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US Patent:

20130298644, Nov 14, 2013
Filed:

May 13, 2013
Appl. No.:

13/892952
Inventors:

Robert Matthew Dean - Houston TX, US
Jack Berroteran - San Ramon CA, US
Sophany Thach - Houston TX, US
Varadarajan Dwarakanath - Houston TX, US
Will S. Slaughter - Houston TX, US
Taimur Malik - Houston TX, US
Assignee:

Chevron U.S.A. Inc. - San Ramon CA
International Classification:

G01N 11/04
US Classification:

73 5401
Abstract:

An apparatus and method are provided for measuring the viscosity of a fluid. The apparatus typically includes an inlet line that is configured to receive a flow of the fluid, and at least one porous medium column that receives the flow of the fluid from the inlet line and resists the flow so that a pressure of the fluid at the outlet is less than a pressure of the fluid at the inlet. A pressure sensor is configured to measure a pressure differential between an inlet and outlet of the column, and the sensor is adapted to determine the viscosity of the fluid according to the pressure differential and the permeability of the porous medium.

Compositions For Use In Oil And Gas Operations
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US Patent:

20220372363, Nov 24, 2022
Filed:

Feb 14, 2022
Appl. No.:

17/670988
Inventors:

- San Ramon CA, US
Varadarajan Dwarakanath - Houston TX, US
Do Hoon Kim - Katy TX, US
Taimur Malik - Houston TX, US
Gregory A. Winslow - Houston TX, US
Aaron Wilhelm - Fulsher TX, US
International Classification:

C09K 8/584
C09K 8/588
C09K 8/68
F17D 1/16
C09K 8/88
C09K 8/52
E21B 43/26
C08L 33/26
C09K 8/60
Abstract:

Disclosed are compositions and methods for use in oil and gas operations.