Patent US4317893A successfully refreshed from Google Patents.
US4317893A
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Oil recovery by waterflooding employing an anionic polymeric surfactant containing recurring succinimide or succinamide groups
Assignee: Mobil Oil AS
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Filing: 1980-10-24
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Granted: 1982-03-02
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Expires: 2000-10-24
Abstract
Abstract A method for the recovery of oil from an oil-containing subterranean formation by waterflooding employing as an injection medium an aqueous solution of an anionic polymeric surfactant formed by reacting a polymer including succinic anhydride moieties with a primary amine to provide a polymeric reaction product in which at least 20 mol percent of the anhydride moieties have been converted, by reaction with said amine, to succinimide or succinamide groups. The polymeric anionic surfactants of the invention exhibit good physical and chemical stability, are shear stable, are effective in maintaining the salt stability of other surfactants (such as petroleum sulfonates) and also function as viscosifiers, even in the presence of significant concentrations of divalent metal ions. According to a preferred form of the invention, the surfactants comprise the reaction product of a copolymer of styrene and maleic anhydride and triethylammonium aniline disulfonate, in which reaction product from 20 mol percent to 40 mol percent of the anhydride moieties have been converted to succinimide or succinamide groups.
Inventors
- 👤 Catherine S. H. Chen
- 👤 Edward W. Sheppard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:46
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584; C08; C08F; C08F8/00; C08F8/30; C08F8/32; C08F8/34; C08F8/40; C09K8/60; C09K8/602; C09K8/604; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
188 words
A water-soluble, polymeric reaction product of: (1) a polymer formed of recurring structural units of the formula ##STR9## wherein R 1 and R 2 are the same or different and are hydrogen or alkyl, aryl, alkaryl or aralkyl radicals having up to 50 carbon atoms and R 3 is hydrogen or is of the formula ##STR10## wherein R 1 and R 2 have the same meaning as hereinabove and m is from 1 to 25 and (2) an amine of the formula (Y).sub.n --R.sub.4 --NH.sub.2 wherein n is a whole number from 1 to 3, R 4 is alkaryl, aryl, alkaryl or aralkyl containing up to 50 carbon atoms and Y is selected from the group consisting of ##STR11## wherein R 5 , R 6 , R 7 and R 8 are alkylene radicals having up to 50 carbon atoms and M is hydrogen or substituted ammonium, in which polymeric reaction product at least 20 mol percent of the anhydride groups have been converted by reaction with said amine to succinimide or succinamide groups, the reaction being carried out at from about 600° C. to about 180° C.
Claim 2
Dependent Claim
188 words
A water-soluble, polymeric reaction product of: (1) a polymer formed of recurring structural units of the formula ##STR9## wherein R 1 and R 2 are the same or different and are hydrogen or alkyl, aryl, alkaryl or aralkyl radicals having up to 50 carbon atoms and R 3 is hydrogen or is of the formula ##STR10## wherein R 1 and R 2 have the same meaning as hereinabove and m is from 1 to 25 and (2) an amine of the formula (Y).sub.n --R.sub.4 --NH.sub.2 wherein n is a whole number from 1 to 3, R 4 is alkaryl, aryl, alkaryl or aralkyl containing up to 50 carbon atoms and Y is selected from the group consisting of ##STR11## wherein R 5 , R 6 , R 7 and R 8 are alkylene radicals having up to 50 carbon atoms and M is hydrogen or substituted ammonium, in which polymeric reaction product at least 20 mol percent of the anhydride groups have been converted by reaction with said amine to succinimide or succinamide groups, the reaction being carried out at from about 600° C. to about 180° C.
Claim 3
Dependent Claim
12 words
The polymer of claim 1 wherein said amine has this formula ##STR12##
Claim 4
Dependent Claim
12 words
The polymer of claim 1 wherein R 3 has the structure ##STR13##
Claim 5
Dependent Claim
13 words
The polymer of claim 1 in which said amine has the formula ##STR14##
Claim 6
Dependent Claim
38 words
A water-soluble styrene-maleic anhydride copolymer of claim 1, in which from 20 mol percent to 40 mol percent of the anhydride groups have been converted to succinimide or succinamide groups by reacting said anhydride groups with said amine.
Claim 7
Dependent Claim
85 words
The copolymer of claim 5 in which said amine is of the formula (Y).sub.n --R.sub.4 --NH.sub.2 wherein: R 4 is alkyl, aryl, alkaryl or aralkyl containing up to 25 carbon atoms, and Y is selected from the group consisting of ##STR15## n is a whole number from 1 to 3, R 5 , R 6 , R 7 and R 8 are alkylene radicals including up to 25 carbon atoms, and M is hydrogen, an alkali or alkaline earth metal, or ammonium or substituted ammonium.
Claim 8
Dependent Claim
14 words
The copolymer of claim 6 in which said amine is of the formula ##STR16##
Claim 9
Dependent Claim
14 words
The copolymer of claim 6 in which said amine is of the formula ##STR17##
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-01 | 1985-08-31 | 1986-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-01 | 1989-08-31 | 1990-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-01 | 1993-08-31 | 1994-03-02 | $7700.00 | Window Closed / Lapsed |