US3369601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary recovery method
Assignee: Union Oil Company of California
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Filing: 1965-01-21
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Granted: 1968-02-20
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Expires: 1985-01-21
Abstract
No abstract record available.
Inventors
- 👤 Donald C Bond
- 👤 George G Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:05
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/243
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN THE METHOD OF RECOVERING OIL FROM AN UNDERGROUND OIL-BEARING FORMATION UNDERLAIN BY A WATER-BEARING FORMATION WHEREIN A BANK OF OIL IS FORMED AHEAD OF A FLUID-DRIVING MEDIUM FORCED THROUGH THE OIL-BEARING FORMATION FROM AN INPUT WELL TOWARD A SPACED OUTPUT WELL AND OIL IS RECOVERED FROM THE OUTPUT WELL, THE IMPROVEMENT WHICH COMPRISES INTRODUCING A FOAM-FORMING SURFACTANT INTO THE WATER-BEARING FORMATION AND SUBSEQUENTLY INJECTING GAS TO THEREIN GENERATE FOAM CAPABLE OF RETARDING THE ENTRY OF SAID FLUID-DRIVING MEANS INTO THE WATER-BEARING FORMATION.
Claim 2
Dependent Claim
83 words
IN THE METHOD OF RECOVERING OIL FROM AN UNDERGROUND OIL-BEARING FORMATION UNDERLAIN BY A WATER-BEARING FORMATION WHEREIN A BANK OF OIL IS FORMED AHEAD OF A FLUID-DRIVING MEDIUM FORCED THROUGH THE OIL-BEARING FORMATION FROM AN INPUT WELL TOWARD A SPACED OUTPUT WELL AND OIL IS RECOVERED FROM THE OUTPUT WELL, THE IMPROVEMENT WHICH COMPRISES INTRODUCING A FOAM-FORMING SURFACTANT INTO THE WATER-BEARING FORMATION AND SUBSEQUENTLY INJECTING GAS TO THEREIN GENERATE FOAM CAPABLE OF RETARDING THE ENTRY OF SAID FLUID-DRIVING MEANS INTO THE WATER-BEARING FORMATION.
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) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |