Patent US3091291A successfully refreshed from Google Patents.
US3091291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of gypsum scale formation in water flood method of oil production
Assignee: UNITED CHEMICAL CORP OF NEW ME
•
Filing: 1960-01-06
•
Granted: 1963-05-28
•
Expires: 1980-01-06
Abstract
No abstract record available.
Inventors
- 👤 Paul A Little
- 👤 Gambill Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:38
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; F; F28; F28G; F28G9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
THE METHOD OF ALTERING THE SURFACE OF AN FORMATION UNDERGROUND IN OIL WELL FLOODING OPERATIONS, WHICH COMPRISES, INCORPORATING IN FLOOD WATER ABOUT 10-10,000 PARTS PER MILLION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AMMONIUM CARBONATE, AMMONIUM CARBAMATE AND MIXTURES THEREOF, THE SAID AMOUNT BEING IN EXCESS OVER THAT NECESSARY TO PRECIPITATE AS CARBONATE ANY CALCIUM PRESENT IN SOLUTION IN THE FLOOD WATER, PASSING SUCH SOLUTION INTO AN OIL WELL, FORCING IT INTO AND THROUGH THE EARTH FORMATION PENETRATED BY SAID OIL WELL, THEREBY TO REACT WITH GYPSUM IN SAID FORMATION AND TO DEPOSIT THEREON A SURFACE LAYER OF CALCIUM CARBONATE, AND RETURNING SUCH SOLUTION TO THE SURFACE.
Claim 2
Independent Claim
109 words
THE METHOD OF ALTERING THE SURFACE OF AN FORMATION UNDERGROUND IN OIL WELL FLOODING OPERATIONS, WHICH COMPRISES, INCORPORATING IN FLOOD WATER ABOUT 10-10,000 PARTS PER MILLION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AMMONIUM CARBONATE, AMMONIUM CARBAMATE AND MIXTURES THEREOF, THE SAID AMOUNT BEING IN EXCESS OVER THAT NECESSARY TO PRECIPITATE AS CARBONATE ANY CALCIUM PRESENT IN SOLUTION IN THE FLOOD WATER, PASSING SUCH SOLUTION INTO AN OIL WELL, FORCING IT INTO AND THROUGH THE EARTH FORMATION PENETRATED BY SAID OIL WELL, THEREBY TO REACT WITH GYPSUM IN SAID FORMATION AND TO DEPOSIT THEREON A SURFACE LAYER OF CALCIUM CARBONATE, AND RETURNING SUCH SOLUTION TO THE SURFACE.
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) | 1966-05-27 | 1966-11-26 | 1967-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-27 | 1970-11-26 | 1971-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-27 | 1974-11-26 | 1975-05-28 | $7700.00 | Window Closed / Lapsed |