US4820429A
Expired / Lapsed
US
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Surfactant compositions for steamfloods
Assignee: Dow Chemical Co
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Filing: 1987-06-02
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Granted: 1989-04-11
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Expires: 2007-06-02
Abstract
Abstract The present invention is an improved surfactant composition useful for providing improved production of oil, or displacing oil within the pores of an oil-containing reservoir under steamflood conditions comprises a synergistic mixture of an α-olefin sulfonate and an alkylated diphenyl oxide sulfonate component.
Inventors
- 👤 Timothy Lim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:53
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/592; E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
93 words
A composition useful for displacing oil within the pores of or for producing oil from an oil-containing reservoir, comprising (a) an aqueous liquid, present in the composition, at a temperature substantially equalling its boiling temperature at the reservoir pressure, in both a liquid phase and vapor phase of steam, and (b) a functionally effective amount of a surfactant mixture consisting essentially of an α-olefin sulfonate surfactant and mono- or di-alkylated diphenyl oxide sulfonate surfactant wherein the alkyl portion of the alkylated diphenyl oxide sulfonate contains from about 6 to about 24 carbon atoms.
Claim 2
Dependent Claim
93 words
A composition useful for displacing oil within the pores of or for producing oil from an oil-containing reservoir, comprising (a) an aqueous liquid, present in the composition, at a temperature substantially equalling its boiling temperature at the reservoir pressure, in both a liquid phase and vapor phase of steam, and (b) a functionally effective amount of a surfactant mixture consisting essentially of an α-olefin sulfonate surfactant and mono- or di-alkylated diphenyl oxide sulfonate surfactant wherein the alkyl portion of the alkylated diphenyl oxide sulfonate contains from about 6 to about 24 carbon atoms.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein the composition further comprises a noncondensable gas.
Claim 4
Dependent Claim
76 words
A steam flooding process for displacing oil from a subterranean formation comprising the step of injecting a liquid comprising a surfactant mixture capable of providing a foam consisting essentially of an α-olefin sulfonate surfactant and a mono- or di-alkylated diphenyl oxide sulfonate surfactant wherein the alkyl portion of the alkylated diphenyl oxide sulfonate contains from about 6 to about 24 carbon atoms into a subterranean reservoir at steam flooding conditions in order to displace oil therein.
Claim 5
Dependent Claim
76 words
A steam flooding process for displacing oil from a subterranean formation comprising the step of injecting a liquid comprising a surfactant mixture capable of providing a foam consisting essentially of an α-olefin sulfonate surfactant and a mono- or di-alkylated diphenyl oxide sulfonate surfactant wherein the alkyl portion of the alkylated diphenyl oxide sulfonate contains from about 6 to about 24 carbon atoms into a subterranean reservoir at steam flooding conditions in order to displace oil therein.
Claim 6
Dependent Claim
22 words
The steam flooding process of claim 3 wherein the surfactant mixture comprises about 0.01 to about 5 weight percent of the composition.
Claim 7
Dependent Claim
40 words
The steam flooding process of claim 3 wherein the alkylated diphenyl oxide sulfonate is an alkali metal, ammonium or amine salt of an alkylated diphenyl oxide sulfonic acid or a water-soluble divalent salt of an alkylated diphenyl oxide sulfonic acid.
Claim 8
Dependent Claim
38 words
A steam flooding process for displacing oil from a subterranean formation comprising the step of injecting a liquid comprising the composition of claim 1 into a subterranean reservoir at steam flooding conditions in order to displace oil therein.
Claim 9
Dependent Claim
15 words
The steam flooding process of claim 6 wherein the composition further comprises a noncondensable gas.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |