Chevron U.s.a. Inc.

Chevron Oronite Company LLC

Adam C Jackson

Varadarajan Dwarakanath

Taimur Malik

Dennis Arun Alexis

Do Hoon Kim

David R Espinosa

Peter G New

Christopher Michael Niemi

Curtis Bay Campbell

Gabriel Prukop

Theresa Ann Denslow

Tanmay Chaturvedi

Sophany Thach

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 &#x3bc;m filter. Also provided are methods of using these aqueous polymer solutions in oil and gas operations, including enhanced oil recovery.

Methods and systems for generating aqueous polymer solutions

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

Enhanced oil recovery surfactant formulation and method of making the same

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.

Method for enhancing oil recovery with an improved oil recovery surfactant

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Aberdeen, United Kingdom

Adam C Jackson