US4825950A
Expired / Lapsed
US
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Method of enhanced oil recovery using a stabilized polymer combination in chemical flood
Assignee: Standard Oil Co
•
Filing: 1988-01-14
•
Granted: 1989-05-02
•
Expires: 2008-01-14
Abstract
Abstract A method is disclosed for recovering oil from a subterranean formation comprising injecting an aqueous composition into said formation and displacing said oil toward one or more production wells, said aqueous composition comprising: (A) from about 0.01% to about 5% by weight of at least one anionic or amphoteric surfactant; (B) from about 0.02% to about 0.3% by weight of at least one polymeric thickener; and (C) from about 0.005% to about 0.1% by weight of at least one polymeric material having a flexible backbone and a higher polarizability than component (B).
Inventors
- 👤 Bayram Kalpakci
- 👤 Tevhide G. Arf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:28
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; C09K8/584; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
90 words
A method for recovering oil from a subterranean formation comprising injecting an aqueous composition into said formation and displacing said oil toward one or more production wells, said aqueous composition comprising: (A) from about 0.01% to about 5% by weight of at least one anionic or amphoteric surfactant; (B) from about 0.02% to about 0.3% by weight of at least one polymeric thickener; and (C) from about 0.005% to about 0.1% by weight of at least one polymeric material having a flexible backbone and a higher polarizability than component (B).
Claim 2
Independent Claim
90 words
A method for recovering oil from a subterranean formation comprising injecting an aqueous composition into said formation and displacing said oil toward one or more production wells, said aqueous composition comprising: (A) from about 0.01% to about 5% by weight of at least one anionic or amphoteric surfactant; (B) from about 0.02% to about 0.3% by weight of at least one polymeric thickener; and (C) from about 0.005% to about 0.1% by weight of at least one polymeric material having a flexible backbone and a higher polarizability than component (B).
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the concentration of (A) in said aqueous composition is from about 0.1% to about 3% by weight.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein the concentration of (A) in said aqueous composition is from about 0.1% to about 1% by weight.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein the concentration of (A) in said aqueous composition is from about 0.1% to about 0.5% by weight.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the concentration of component (B) in said aqueous composition is from about 0.05% to about 0.15% by weight.
Claim 7
Dependent Claim
24 words
The method of claim 1 wherein the concentration of component (C) in said aqueous composition is from about 0.01% to about 0.05% by weight.
Claim 8
Dependent Claim
80 words
The method of claim 1 wherein component (A) is at least one compound represented by the formula RO--(R').sub.n R"X--Y+ wherein: R is a hydrocarbyl group of from about 10 to about 24 carbon atoms; R' is ethoxy, propoxy or a mixture thereof; R" is a divalent hydrocarbyl group of 1 to about 20 carbon atoms; X is a sulfate, sulfonate or carboxylate group; Y is a cation; and n is a number in the range of 1 to about 20.
Claim 9
Dependent Claim
19 words
The method of claim 7 wherein R is a hydrocarbyl group of about 10 to about 20 carbon atoms.
Claim 10
Dependent Claim
19 words
The method of claim 7 wherein R is a hydrocarbyl group of about 12 to about 18 carbon atoms.
Claim 11
Dependent Claim
14 words
The method of claim 7 wherein R is an alkyl or an alkenyl group.
Claim 12
Dependent Claim
19 words
The method of claim 7 wherein R" is a divalent hydrocarbyl group of 1 to about 10 carbon atoms.
Claim 13
Dependent Claim
13 words
The method of claim 1 wherein component (A) is a hydrocarbyl-substituted polyoxyalkylene sulfonate.
Claim 14
Dependent Claim
45 words
The method of claim 1 wherein component (A) is a compound represented by the formula R.sup.6 --X--M+ wherein R 6 is a hydrocarbyl group of about 10 to about 28 carbon atoms, X is a sulfate, sulfonate or carboxylate group, and M is a cation.
Claim 15
Dependent Claim
116 words
The method of claim 1 wherein component (A) is a compound represented by the formula ##STR8## wherein: R 7 is a hydrocarbyl group of 1 to about 14 carbon atoms; R 8 is a hydrocarbyl group of 1 to about 5 carbon atoms; R 9 is a divalent hydrocarbyl group of 1 to about 3 carbon atoms; and R 10 is a hydrocarbyl group of about 8 to about 28 carbon atoms or represented by the formula ##STR9## wherein R 11 is a hydrocarbyl group of about 6 to about 26 carbon atoms, R 12 is a divalent hydrocarbyl group of about 1 to about 6 carbon atoms; and Z is SO 3 -- or COO--.
Claim 16
Dependent Claim
13 words
The method of claim 14 wherein R 7 and R 8 are methyl.
Claim 17
Dependent Claim
10 words
The method of claim 14 wherein R 9 is ##STR10##
Claim 18
Dependent Claim
16 words
The method of claim 14 wherein R 10 has about 16 to about 22 carbon atoms.
Claim 19
Dependent Claim
15 words
The method of claim 14 wherein R 10 is an alkyl or an alkenyl group.
Claim 20
Dependent Claim
45 words
The method of claim 14 wherein R 10 is represented by the formula ##STR11## wherein R 13 is hydrogen or a hydrocarbyl group of 1 to about 20 carbon atoms and R 14 is a divalent hydrocarbyl carbyl of 1 to about 20 carbon atoms.
Claim 21
Dependent Claim
56 words
The method of claim 14 wherein R 10 is represented by the formula R.sup.15 --R.sup.16 O).sub.y wherein R 15 is a hydrocarbyl group of about 6 to about 26 carbon atoms, R 16 is a divalent hydrocarby group of about 2 to about 18 carbon atoms, and y is an integer of 1 to about 4.
Claim 22
Dependent Claim
11 words
The method of claim 1 wherein component (B) is a polysaccharide.
Claim 23
Dependent Claim
13 words
The method of claim 1 wherein component (B) is a partially hydrolyzed polyacrylamide.
Claim 24
Dependent Claim
12 words
The method of claim 1 wherein component (B) is a xanthan gum.
Claim 25
Dependent Claim
11 words
The method of claim 1 wherein component (B) is a homopolysaccharide.
Claim 26
Dependent Claim
34 words
The method of claim 1 wherein component (B) is represented by the formula ##STR12## wherein m is an integer that is sufficiently high enough to provide a molecular weight of above about one million.
Claim 27
Dependent Claim
11 words
The method of claim 1 wherein component (C) is polyvinyl alcohol.
Claim 28
Dependent Claim
10 words
The method of claim 1 wherein component (C) is polyoxyethylene.
Claim 29
Dependent Claim
10 words
The method of claim 1 wherein component (C) is polyvinylpyrrolidone.
Claim 30
Dependent Claim
72 words
The method of claim 1 wherein said aqueous composition comprises a surfactant slug, said method further comprising the steps of injecting into said formation a buffer slug to follow said surfactant slug, said buffer slug comprising an aqueous solution containing an effective amount of at least one thickener to provide said buffer slug with a viscosity exceeding the viscosity of said surfactant slug, then injecting into said formation an aqueous flooding medium.
Claim 31
Dependent Claim
28 words
The method of claim 1 wherein said aqueous composition comprises a surfactant slug, said method further comprising the step of injecting into said formation an aqueous flooding medium.
Claim 32
Dependent Claim
16 words
The method of claim 1 wherein the water employed in said aqueous composition is sea water.
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