Patent US2457404A successfully refreshed from Google Patents.
Patent US2876840A successfully refreshed from Google Patents.
US2876840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asphalt plugging of gas zones
Assignee: Pan American Petroleum Corp
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Filing: 1957-06-24
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Granted: 1959-03-10
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Expires: 1977-06-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Virgil J Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:39
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/502; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A METHOD FOR DECREASING THE PERMEABILITY OF A ZONE OF A FORMATION PENETRATED BY A WELL COMPRISING SEPARATELY INJECTING A PUMPABLE TREATING DISPERSION AND A DILUENT INTO SAID ZONE IN A RATIO OF ABOUT 1 TO 5 TO A RATIO OF ABOUT 5 TO 1, SAID DILUENT BEING A LIQUID WHICH IS A SELECTIVE SOLVENT FOR MALTENES AND CAPABLE OF PRECIPITATING ASPHALTENES FROM SAID TREATING DISPERSION, AND SAID TREATING DISPERSION CONSISTING ESSENTIALLY OF A HYDROCARBON LIQUID BOILING PREDOMINANTLY ABOVE ABOUT 450* F., ASPHALTENS IN AN AMOUNT SUFFICIENT TO FORM A PRECIPITATE AMOUNTING TO AT LEAST ABOUT 10 PERCENT BY WEIGHT OF THE TREATING DISPERSION WHEN DILUTED WITH FROM ABOUT 2 TO ABOUT 10 TIMES AS MUCH DILUENT AS TREATING DISPERSION, AND MALTENES IN AN AMOUNT SUFFICIENT TO HOLD SAID ASPHALTENES PEPTIZED IN THE COLLODIAL STATE IN SAID VEHICLE IN THE ABSENCE OF SAID DILUENT.
Claim 2
Independent Claim
144 words
A METHOD FOR DECREASING THE PERMEABILITY OF A ZONE OF A FORMATION PENETRATED BY A WELL COMPRISING SEPARATELY INJECTING A PUMPABLE TREATING DISPERSION AND A DILUENT INTO SAID ZONE IN A RATIO OF ABOUT 1 TO 5 TO A RATIO OF ABOUT 5 TO 1, SAID DILUENT BEING A LIQUID WHICH IS A SELECTIVE SOLVENT FOR MALTENES AND CAPABLE OF PRECIPITATING ASPHALTENES FROM SAID TREATING DISPERSION, AND SAID TREATING DISPERSION CONSISTING ESSENTIALLY OF A HYDROCARBON LIQUID BOILING PREDOMINANTLY ABOVE ABOUT 450* F., ASPHALTENS IN AN AMOUNT SUFFICIENT TO FORM A PRECIPITATE AMOUNTING TO AT LEAST ABOUT 10 PERCENT BY WEIGHT OF THE TREATING DISPERSION WHEN DILUTED WITH FROM ABOUT 2 TO ABOUT 10 TIMES AS MUCH DILUENT AS TREATING DISPERSION, AND MALTENES IN AN AMOUNT SUFFICIENT TO HOLD SAID ASPHALTENES PEPTIZED IN THE COLLODIAL STATE IN SAID VEHICLE IN THE ABSENCE OF SAID DILUENT.
References Cited (Backward Citations)
US2713906A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |