US3332486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surfactant-waterflooding process
Assignee: Cities Service Oil Co
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Filing: 1965-06-28
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Granted: 1967-07-25
•
Expires: 1985-06-28
Abstract
No abstract record available.
Inventors
- 👤 Mcghee John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:35
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A METHOD FOR RECOVERING OIL FROM SUBTERRANEAN RESERVOIRS BY SURFACTANT WATERFLOOD INJECTION COMPRISING: (A) INJECTING A SURFACTANT SLUG NOT EXCEEDING ABOUT 40% OF THE FORMATION PORE VOLUME INTO THE FORMATION, SAID SLUG CONTAINING NOT MORE THAN ABOUT 10% BY WEIGHT SURFAC TANTS, THE SURFACTANT SLUG COMPRISING A COMBINATION OF NON-IONIC AND ANIONIC SURFACTANTS, THE NON-IONIC AND ANIONIC PORTIONS OF THE SURFACTANT SLUG BEING BLENDED IN SUCH PROPORTIONS THAT THEY HYDROPHILIC-LIPOPHLIC BALANCE OF THE SURFACTANT SLUG IS APPROXIMATELY THE SAME AS THE ASSOCIATED WITH THE CRUDE OIL-INJECTION WATER SYSTEM AND THE WEIGHT RATIO OF ANIONIC TO NON-IONIC SURFACTANTS IS APPROXIMATELY THE SAME AS THE OPTIMUM ANIONIC TO NON-IONIC SURFACTANT RATIO ASSOCIATED WITH SAID CRUDE OIL-INJECTION WATER SYSTEM; AND (B) DRIVING THE SURFACTANT SLUG THROUGH THE FORMATION BY MEANS OF A WATERFLOOD.
Claim 2
Independent Claim
130 words
A METHOD FOR RECOVERING OIL FROM SUBTERRANEAN RESERVOIRS BY SURFACTANT WATERFLOOD INJECTION COMPRISING: (A) INJECTING A SURFACTANT SLUG NOT EXCEEDING ABOUT 40% OF THE FORMATION PORE VOLUME INTO THE FORMATION, SAID SLUG CONTAINING NOT MORE THAN ABOUT 10% BY WEIGHT SURFAC TANTS, THE SURFACTANT SLUG COMPRISING A COMBINATION OF NON-IONIC AND ANIONIC SURFACTANTS, THE NON-IONIC AND ANIONIC PORTIONS OF THE SURFACTANT SLUG BEING BLENDED IN SUCH PROPORTIONS THAT THEY HYDROPHILIC-LIPOPHLIC BALANCE OF THE SURFACTANT SLUG IS APPROXIMATELY THE SAME AS THE ASSOCIATED WITH THE CRUDE OIL-INJECTION WATER SYSTEM AND THE WEIGHT RATIO OF ANIONIC TO NON-IONIC SURFACTANTS IS APPROXIMATELY THE SAME AS THE OPTIMUM ANIONIC TO NON-IONIC SURFACTANT RATIO ASSOCIATED WITH SAID CRUDE OIL-INJECTION WATER SYSTEM; AND (B) DRIVING THE SURFACTANT SLUG THROUGH THE FORMATION BY MEANS OF A WATERFLOOD.
References Cited (Backward Citations)
US2233382A
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US2800962A
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US2812817A
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US3056452A
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US3096820A
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US3288213A
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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) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |