US3141501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of permeability during water flooding
Assignee: Pure Oil Co
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Filing: 1960-08-26
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Granted: 1964-07-21
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Expires: 1980-08-26
Abstract
No abstract record available.
Inventors
- 👤 George G Bernard
- 👤 Orrin C Holbrook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:18
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/60; C09K8/62; C09K8/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
IN THE RECOVERY OF OIL FROM UNDERGROUND FORMATIONS WHICH CONTAIN A BASIC MATERIAL AND A WATER-SENSITIVE CLAY BY THE INJECTION WELL AND INTO SAID FORMATION, AND THE RECOVERY OF OIL FROM A PRODUCING WELL, THE IMPROVEMENT COMPRISING EMPLOYING AS SAID FLOODWATER A COMPOSITION CONSISTING ESSENTIALLY OF SUBSTANTIALLY FRESH WATER ACIDIFIED TO A PH OF 1-3 BY THE ADDITION THERETO OF AN ACID CAPABLE OF REACTING WITH SAID BASIC MATERIAL TO FORM A SUBSTANTIALLY WATER-INSOLUBLE PRECIPITATE.
Claim 2
Dependent Claim
75 words
IN THE RECOVERY OF OIL FROM UNDERGROUND FORMATIONS WHICH CONTAIN A BASIC MATERIAL AND A WATER-SENSITIVE CLAY BY THE INJECTION WELL AND INTO SAID FORMATION, AND THE RECOVERY OF OIL FROM A PRODUCING WELL, THE IMPROVEMENT COMPRISING EMPLOYING AS SAID FLOODWATER A COMPOSITION CONSISTING ESSENTIALLY OF SUBSTANTIALLY FRESH WATER ACIDIFIED TO A PH OF 1-3 BY THE ADDITION THERETO OF AN ACID CAPABLE OF REACTING WITH SAID BASIC MATERIAL TO FORM A SUBSTANTIALLY WATER-INSOLUBLE PRECIPITATE.
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) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |