US3203480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of sulfides in flooding water
Assignee: Pan American Petroleum Corp
•
Filing: 1963-03-18
•
Granted: 1965-08-31
•
Expires: 1983-03-18
Abstract
No abstract record available.
Inventors
- 👤 Froning H Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:31
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
115 words
A PROCESS FOR WATER FLOODING AN OIL-BEARING FORMATION PENETRATED BY AT LEAST ONE INJECTION WELL AND AT LEAST ONE PRODUCING WELL COMPRISING INTRODUCING INTO SAID FORMATION THROUGH SAID INJECTION WELL AN AQUEOUS SOLUTION OF A SULFIDE SALT SELECTED FROM THE GROUP CONSISTING OF AMMONIUM SULFIDES AND ALKALI METALSULFIDES, THE CONCENTRATION OF SAID SULFIDE SALT AND THE PH OF SAID SOLUTION BEING SUFFICIENT TO MAKE SAID FORMATION MORE WATER WETTABLE THAN IT IS WHEN IN CONTACT WITH THE NATURALLY OCCURRING OIL AND WATER IN SAID FORMATION, THE VOLUME OF SAID AQUEOUS SOLUTION BEING AT LEAST ABOUT 1 PERCENT OF THE PORE VOLUME EXPECTED TO BE FLOODED, AND RECOVERING OIL FROM SAID AT LEAST ONE PRODUCING WELL.
References Cited (Backward Citations)
US3163213A
Cited
US3120262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |