US3191676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of phosphates in a waterflooding process
Assignee: Pan American Petroleum Corp
•
Filing: 1962-11-14
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Granted: 1965-06-29
•
Expires: 1982-11-14
Abstract
No abstract record available.
Inventors
- 👤 Froning H Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:35
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
100 words
IN A METHOD OF WATERFLOODING A CARBONATE-CONTAINING OIL-BEARING EARTH FORMATION PENETRATED BY AT LEAST ONE INJECTION WELL AND AT LEAST ONE PRODUCING WELL IN WHICH METHOD A PHOSPHATE IS INCLUDED IN THE FLOODING WATER A INCREASE OIL RECOVERY FROM SAID PRODUCING WELL, THE IMPROVEMENT COMPRISING THE ADDITION TO SAID WATER BEFORE IT IS INJECTED INTO SAID AT LEAST ONE INJECTION WELL OF SUFFICIENT OF A WATER-SOLUBLE CARBONATE TO PROVIDE A MOLAR RATIO OF CARBONATE TO PHOSPHATE OF AT LEAST ABOUT 0.3 TO 1, AND SUFFICIENT CARBONATE BEING ADDED TO PROVIDE A PH OF AT LEAST ABOUT 6 IN SAID WATER.
References Cited (Backward Citations)
US2246726A
Cited
US2747670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-28 | 1968-12-28 | 1969-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-28 | 1972-12-28 | 1973-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-28 | 1976-12-28 | 1977-06-29 | $7700.00 | Window Closed / Lapsed |