Patent US5167281A successfully refreshed from Google Patents.
US5167281A
Expired / Lapsed
US
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Dialkylate additives for surfactant sytems
Assignee: Texaco Inc
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Filing: 1991-11-07
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Granted: 1992-12-01
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Expires: 2011-11-07
Abstract
Abstract The invention is a method of moving hydrocarbons through an underground formation for later recovery which comprises injecting an aqueous surfactant system having about 0.5% to about 10% of one or more surfactants and about 0.5% to about 10% of an alkoxylated dialkylate having the formula: R.sub.1 (R.sub.3 O).sub.n R.sub.2 wherein R 1 and R 2 are alkyl chains having about 3 to about 30 carbon atoms, R 3 is C 2 H 4 , C 3 H 6 or a mixture of C 2 H 4 and C 3 H 6 , and n equals about 4 to about 300.
Inventors
- 👤 George Kalfoglou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:17
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
118 words
A method of moving hydrocarbons through an underground hydrocarbon formation for recovery at a production well, which comprises: injecting into the formation about 0.05 to about 1.0 pore volumes of an aqueous surfactant system, said surfactant system comprising about 0.5% to about 10% of one or more surfactants and about 0.5% to about 10% of an alkoxylated dialkylate, said dialkylate having the formula: R.sub.1 (R.sub.3 O).sub.n R.sub.2 wherein R 1 and R 2 are alkyl chains having about 3 to about 30 carbon atoms, R 3 is C 2 H 4 , C 3 H 6 or a mixture of C 2 H 4 and C 3 H 6 , and n equals about 4 to about 300.
Claim 2
Independent Claim
118 words
A method of moving hydrocarbons through an underground hydrocarbon formation for recovery at a production well, which comprises: injecting into the formation about 0.05 to about 1.0 pore volumes of an aqueous surfactant system, said surfactant system comprising about 0.5% to about 10% of one or more surfactants and about 0.5% to about 10% of an alkoxylated dialkylate, said dialkylate having the formula: R.sub.1 (R.sub.3 O).sub.n R.sub.2 wherein R 1 and R 2 are alkyl chains having about 3 to about 30 carbon atoms, R 3 is C 2 H 4 , C 3 H 6 or a mixture of C 2 H 4 and C 3 H 6 , and n equals about 4 to about 300.
Claim 3
Dependent Claim
13 words
The method of claim 1, wherein n equals about 10 to about 250.
Claim 4
Dependent Claim
22 words
The method of claim 2, wherein R 1 and R 2 are alkyl chains having about 7 to about 20 carbon atoms.
Claim 5
Dependent Claim
13 words
The method of claim 1, wherein n equals about 30 to about 200.
Claim 6
Dependent Claim
22 words
The method of claim 4, wherein R 1 and R 2 are alkyl chains having about 7 to about 20 carbon atoms.
Claim 7
Dependent Claim
13 words
The method of claim 1, wherein one or more surfactants are anionic surfactants.
Claim 8
Dependent Claim
31 words
The method of claim 6, wherein the anionic surfactant is a sulfated ethoxylated alcohol having about 10 to about 16 carbon atoms and about 5 to about 8 ethylene oxide groups.
Claim 9
Dependent Claim
13 words
The method of claim 1, wherein one or more surfactants are nonionic surfactants.
Claim 10
Dependent Claim
13 words
The method of claim 1, wherein one or more surfactants are cationic surfactants.
Claim 11
Dependent Claim
13 words
The method of claim 1, wherein one or more surfactants are amphoteric surfactants.
Claim 12
Dependent Claim
30 words
The method of claim 1, wherein R 1 and R 2 are alkyl chains having about 12 to about 20 carbon atoms and n equals about 50 to about 200.
Claim 13
Dependent Claim
30 words
The method of claim 1, wherein R 1 and R 2 are alkyl chains having about 6 to about 12 carbon atoms and n equals about 150 to about 200.
Claim 14
Dependent Claim
18 words
The method of claim 1, wherein the surfactant system comprises two or more alkoxylated dialkylates having different formulas.
Claim 15
Independent Claim
118 words
A method of moving hydrocarbons through an underground hydrocarbon formation for recovery at a production well, which comprises: injecting into the formation about 0.1 to about 0.3 pore volumes of an aqueous surfactant system, said surfactant system comprising about 1% to about 5% of one or more surfactants and about 1% to about 5% of an alkoxylated dialkylate, said dialkylate having the formula: R.sub.1 (R.sub.3 O).sub.n R.sub.2 wherein R 1 and R 2 are alkyl chains having about 7 to about 20 carbon atoms, R 3 is C 2 H 4 , C 3 H 6 or a mixture of C 2 H 4 and C 3 H 6 , and n equals about 30 to about 200.
Claim 16
Independent Claim
118 words
A method of moving hydrocarbons through an underground hydrocarbon formation for recovery at a production well, which comprises: injecting into the formation about 0.1 to about 0.3 pore volumes of an aqueous surfactant system, said surfactant system comprising about 1% to about 5% of one or more surfactants and about 1% to about 5% of an alkoxylated dialkylate, said dialkylate having the formula: R.sub.1 (R.sub.3 O).sub.n R.sub.2 wherein R 1 and R 2 are alkyl chains having about 7 to about 20 carbon atoms, R 3 is C 2 H 4 , C 3 H 6 or a mixture of C 2 H 4 and C 3 H 6 , and n equals about 30 to about 200.
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