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US 12,480,036 B2Granted
Polyanionic surfactants and methods of making and using thereof
AssigneeChevron U.S.A. Inc.
InventorsGayani W. Pinnawala, Sujeewa S. Palayangoda, Gregory A. Winslow, Varadarajan Dwarakanath
Life of this patent
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Abstract
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.
Claims14
A surfactant defined by Formula I below
- R1—(CH2)n-(AO)w-HG Formula I
- or a salt thereof, wherein
- HG represents a head group comprising from 1-3 carboxylate moieties;
- R1 represents a C7-C32 alkyl group substituted with from one to three sulfonate moieties and optionally with from one to three substituents selected from hydroxy and alkoxy, a C7-C32 alkylaryl group substituted with from one to three sulfonate moieties and optionally with from one to three substituents selected from hydroxy and alkoxy, a C7-C32 alkenyl group substituted with from one to three sulfonate moieties and optionally with from one to three substituents selected from hydroxy and alkoxy, or a C7-C32 alkenylaryl group substituted with from one to three sulfonate moieties and optionally with from one to three substituents selected from hydroxy and alkoxy;
- where R1 comprises one of the following:
- or a salt thereof, wherein
- a is an integer from 0 to 32;
- and
- b is an integer from 0 to 32,
- with the proviso that the sum of a and b is from 4 to 32;
- n is an integer from 1 to 8;
- AO represents, individually for each occurrence, an alkyleneoxy group selected from an ethoxy group, a propoxy group, or a butoxy group;
- and
- w is an integer from 1 to 110.
11 more elements
Dependencies are inferred from the claim text.