US3135326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary oil recovery method
Assignee: Oil Sand Conditioning Corp
•
Filing: 1960-11-21
•
Granted: 1964-06-02
•
Expires: 1980-11-21
Abstract
No abstract record available.
Inventors
- 👤 Harold P Santee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:39
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/594; E; E21; E21B; E21B43/00; E21B43/16; E21B43/164; Y; Y02; Y02P; Y02P90/00; Y02P90/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A METHOD OF OIL RECOVERY FROM SUBTERRANEAN FORMATIONS PENETRATED BY AN INJECTION WELL AND A PRODUCTION WELL COMPRISING THE STEPS OF SEQUENTIALLY INJECTING INTO SAID INJECTION WELL; A FIRST BANK OF FLUID MISCIBLE WITH SAID OIL TO CAUSE A GRADUAL VISCOSITY GRADIENT BETWEEN THAT OF SAID OIL AND A SECOND BANK; SAID SECOND BANK COMPRISING A WATER SOLUTION AT A TEMPERATURE BETWEEN THE RANGE OF 30-40*F. AND CONTAINING CARBON DIOXIDE GAS IN AN AMOUNT WITHIN THE RANGE OF 12 TO 20 CUBIC FEET PER CUBIC FOOT OF SAID SOLUTION AT STANDARD CONDITIONS AND FURTHER CONTAINING CITRIC ACID OF AT LEAST .025 POUND PER BARREL OF SAID SOLUTION; A THIRD BANK OF A WATER SOLUTION AT A TEMPERATURE BETWEEN THE RANGE OF 100*F. AND 212* F. AND CONTAINING A WATER SOLUBLE SURFACTANT CAPABLE OF REDUCING THE INTERFICIAL TENSION BETWEEN SAID FORMATION AND SAID OIL; DRIVING SAID BANKS FROM SAID INJECTION WELL
Claim 2
Independent Claim
150 words
A METHOD OF OIL RECOVERY FROM SUBTERRANEAN FORMATIONS PENETRATED BY AN INJECTION WELL AND A PRODUCTION WELL COMPRISING THE STEPS OF SEQUENTIALLY INJECTING INTO SAID INJECTION WELL; A FIRST BANK OF FLUID MISCIBLE WITH SAID OIL TO CAUSE A GRADUAL VISCOSITY GRADIENT BETWEEN THAT OF SAID OIL AND A SECOND BANK; SAID SECOND BANK COMPRISING A WATER SOLUTION AT A TEMPERATURE BETWEEN THE RANGE OF 30-40*F. AND CONTAINING CARBON DIOXIDE GAS IN AN AMOUNT WITHIN THE RANGE OF 12 TO 20 CUBIC FEET PER CUBIC FOOT OF SAID SOLUTION AT STANDARD CONDITIONS AND FURTHER CONTAINING CITRIC ACID OF AT LEAST .025 POUND PER BARREL OF SAID SOLUTION; A THIRD BANK OF A WATER SOLUTION AT A TEMPERATURE BETWEEN THE RANGE OF 100*F. AND 212* F. AND CONTAINING A WATER SOLUBLE SURFACTANT CAPABLE OF REDUCING THE INTERFICIAL TENSION BETWEEN SAID FORMATION AND SAID OIL; DRIVING SAID BANKS FROM SAID INJECTION WELL
References Cited (Backward Citations)
US2875831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |