Chevron U.s.a. Inc.

Sujeewa S Palayangoda

Gayani W Pinnawala

Gregory Arthur Winslow

Varadarajan Dwarakanath

Dennis Arun Alexis

Sophany Thach

Sumitra Subrahmanyan

Kerry Kennedy Spilker

Harold Charles Linnemeyer

Timothy P Theriot

Les Leszek Jackowski

Francesca Cibotti

Taimur Malik

Mohsen S Tagavifar

Mohamad Salman

Behdad Aminzadeh Goharrizi

Sriram Chandrasekhar

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.

Polyanionic surfactants and methods of making and using thereof

Compositions and methods that can be used to sequester carbon dioxide within a subterranean formation are described. The methods can include contacting carbon dioxide present in the subterranean formation with a complexing agent, resulting in precipitation of a carbonate or bicarbonate salt of the complexing agent within the subterranean formation.

Compositions and methods for carbon dioxide solidification

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.

Described herein are methods of treating fluid including hydrocarbons, water, and polymer being produced from a hydrocarbon-bearing formation. The methods include 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 viscosity reducer is buffered at a pH of 7 or less. 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.

Ph control in fluid treatment

Disclosed herein are methods and composition for breaking foam, emulsions, or any combination thereof.

Compositions and methods for breaking foams and emulsions

Described herein are methods of treating fluid comprising hydrocarbons, water, and polymer being produced from a hydrocarbon-bearing formation are provided. The method can include 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 viscosity reducer is buffered at a pH of 7 or less (e.g., at a pH of from 2 to 7, such as at a pH of from 3.5 to 7, or at a pH of from 5 to 7). 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.

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San Ramon, CA, United States of America

Sujeewa S Palayangoda