Patent US4556108A successfully refreshed from Google Patents.
US4556108A
Expired / Lapsed
US
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Micellar slug for oil recovery
Assignee: Lion Corp
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Filing: 1983-03-31
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Granted: 1985-12-03
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Expires: 2003-03-31
Abstract
Abstract A micellar slug for use in the recovery of oil, the slug containing a hydrocarbon, an aqueous medium, a surfactant, and a cosurfactant. The surfactant contains as an essential component an internal olefin sulfonate having 10 to 26 carbon atoms and a disulfonate content of about 20% by weight or less. This micellar slug has an excellent capability for decreasing an interfacial tensions between oil and micro-emulsions and between water and micro-emulsions and an excellent salinity tolerance and hard-water resistance. Furthermore, the stable micro-emulsion from this micellar slug can be maintained during sweeping in subterranean reservoirs even when the salt concentration of the subterranean water is changed.
Inventors
- 👤 Hiroshi Morita
- 👤 Yasuyuki Kawada
- 👤 Junichi Yamada
- 👤 Toshiyuki Ukigai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:23
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936; Y10S507/937; Y10S507/938
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
60 words
A micellar slug for use in the recovery of oil, said slug consisting essentially of a hydrocarbon, an aqueous medium containing about 2% to 15% inorganic salt, a surfactant and a cosurfactant said surfactant containing, as an essential component, an internal olefin sulfonate having 10 to 26 carbon atoms and a disulfonate content of about 20% by weight of less.
Claim 2
Dependent Claim
60 words
A micellar slug for use in the recovery of oil, said slug consisting essentially of a hydrocarbon, an aqueous medium containing about 2% to 15% inorganic salt, a surfactant and a cosurfactant said surfactant containing, as an essential component, an internal olefin sulfonate having 10 to 26 carbon atoms and a disulfonate content of about 20% by weight of less.
Claim 3
Dependent Claim
21 words
A micellar slug as claimed in claim 1, wherein said surfactant is internal olefin sulfonates having 12 to 24 carbon atoms.
Claim 4
Dependent Claim
57 words
A micellar slug as claimed in claim 1, wherein said micellar slug consists essentially of about 2% to about 90% by weight of the hydrocarbon, about 4% to about 95% by weight of the aqueous medium, about 1% to about 30% by weight of the surfactant, and about 0.1% to about 20% by weight of the cosurfactant.
Claim 5
Dependent Claim
78 words
A micellar slug as claimed in claim 1, wherein said cosurfactant has the general formula: RO(CH.sub.2 CH.sub.2 O).sub.n H wherein n is a number of from 0 to about 4 and R is an alkyl or alkenyl group having 4 to 8 carbon atoms when n is zero and an alkyl or alkenyl group having 6 to 15 carbon atoms, a phenyl group, or an alkylphenyl group having 7 to 16 carbon atoms when n is not zero.
Claim 6
Dependent Claim
106 words
A process for producing oil from an oil-bearing subterranean reservoir penetrated by wells which comprises the steps of: (1) injecting into a subterranean reservoir having water with a salinity content within the range of 0.1% to 15%, through an injection well the micellar slug consisting essentially of a hydrocarbon, an aqueous medium, a surfactant, and a cosurfactant, said surfactant containing, as an essential component, an internal olefin sulfonate having 10 to 26 carbon atoms and a disulfonate content of about 20% by weight or less; (2) injecting into said reservoir at least one driving fluid; and (3) recovering oil from said reservoir through a production well.
Claim 7
Dependent Claim
106 words
A process for producing oil from an oil-bearing subterranean reservoir penetrated by wells which comprises the steps of: (1) injecting into a subterranean reservoir having water with a salinity content within the range of 0.1% to 15%, through an injection well the micellar slug consisting essentially of a hydrocarbon, an aqueous medium, a surfactant, and a cosurfactant, said surfactant containing, as an essential component, an internal olefin sulfonate having 10 to 26 carbon atoms and a disulfonate content of about 20% by weight or less; (2) injecting into said reservoir at least one driving fluid; and (3) recovering oil from said reservoir through a production well.
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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) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |