US4335787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of oil recovery with surfactant flooding
Assignee: Phillips Petroleum Co
•
Filing: 1980-09-12
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Granted: 1982-06-22
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Expires: 2000-09-12
Abstract
Abstract A surfactant system useful for oil recovery comprises a surfactant, such as a petroleum sulfonate, and a nitrile cosurfactant, such as acrylonitrile.
Inventors
- 👤 Paul R. Stapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:12
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
Process for hydrocarbon recovery from a subterranean formation comprising (a) injecting a surfactant system comprising a hydrocarbon sulfonate surfactant and a nitrile cosurfactant into said formation via at least one injection well, (b) causing the so-injected surfactant system to move from the injection well towards one or more production wells displacing hydrocarbon present in said formation, (c) recovering displaced hydrocarbon from at least one of said production wells.
Claim 2
Dependent Claim
68 words
Process for hydrocarbon recovery from a subterranean formation comprising (a) injecting a surfactant system comprising a hydrocarbon sulfonate surfactant and a nitrile cosurfactant into said formation via at least one injection well, (b) causing the so-injected surfactant system to move from the injection well towards one or more production wells displacing hydrocarbon present in said formation, (c) recovering displaced hydrocarbon from at least one of said production wells.
Claim 3
Dependent Claim
22 words
A process in accordance with claim 1 wherein a mobility buffer fluid is injected into said subterranean formation following said surfactant system.
Claim 4
Dependent Claim
23 words
A process in accordance with claim 2 wherein an aqueous drive fluid is injected into said subterranean formation following said mobility buffer fluid.
Claim 5
Dependent Claim
26 words
A process in accordance with claim 1 wherein said surfactant system further comprises a protective agent and is injected into a subterranean formation containing hard brine.
Claim 6
Dependent Claim
17 words
A process in accordance with claim 1 wherein said surfactant system comprises a petroleum sulfonate and acrylonitrile.
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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) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |