Oya Aysen Karazincir

US Patent:

20120097389, Apr 26, 2012

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
E21B 33/13

US Classification:

1662701, 166 7515

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.

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.