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Patent US3288212A successfully refreshed from Google Patents.
US3288212A
Expired / Lapsed
US
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Secondary oil recovery method
Assignee: Union Oil Company of California
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Filing: 1964-05-21
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Granted: 1966-11-29
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Expires: 1984-05-21
Abstract
No abstract record available.
Inventors
- 👤 Leo J O'brien
- 👤 Le Roy W Holm
- 👤 Walter Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:09
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
IN THE METHOD OF PRODUCING PETROLEUM FROM A FLUIDFLOODED SUBTERRANEAN OIL-BEARING FORMATION TRAVERSED BY A PLURALITY OF WELLS WHEREIN A FIRST AQUEOUS FLUID IS INJECTED INTO THE FORMATION BY MEANS OF A FIRST INJECTION WELL AND SAID FIRST FLUID IS DRIVEN THROUGH SAID FORMATION TOWARD A PRODUCING WELL, THE IMPROVEMENT COMPRISING INJECTING A SECOND FLUID INTO SAID FORMATION THROUGH A SECOND INJECTION WELL INTERMEDIATE SAID FIRST INJECTING WELL AND SAID PRODUCING WELL, AND SIMULTANEOUSLY WITHDRAWING A PORTION OF SAID FIRST INJECTED FLUID FROM AN AREA ADJACENT TO AND UPSTREAM FROM SAID SECOND INJECTION WELL, THE WITHDRAWAL OF SAID PORTION OF FIRST INJECTED FLUID CREATING A PRESSURE GRADIENT RELATIVE TO THE REMAINDER OF SAID FORMATION AND THEREBY INCREASING THE SWEEP EFFICIENCY OF SAID SECOND INJECTED FLUID, AND DRIVING SAID SECOND INJECTED FLUID THROUGH SAID FORMATION TOWARD SAID PRODUCING WELL.
Claim 2
Dependent Claim
138 words
IN THE METHOD OF PRODUCING PETROLEUM FROM A FLUIDFLOODED SUBTERRANEAN OIL-BEARING FORMATION TRAVERSED BY A PLURALITY OF WELLS WHEREIN A FIRST AQUEOUS FLUID IS INJECTED INTO THE FORMATION BY MEANS OF A FIRST INJECTION WELL AND SAID FIRST FLUID IS DRIVEN THROUGH SAID FORMATION TOWARD A PRODUCING WELL, THE IMPROVEMENT COMPRISING INJECTING A SECOND FLUID INTO SAID FORMATION THROUGH A SECOND INJECTION WELL INTERMEDIATE SAID FIRST INJECTING WELL AND SAID PRODUCING WELL, AND SIMULTANEOUSLY WITHDRAWING A PORTION OF SAID FIRST INJECTED FLUID FROM AN AREA ADJACENT TO AND UPSTREAM FROM SAID SECOND INJECTION WELL, THE WITHDRAWAL OF SAID PORTION OF FIRST INJECTED FLUID CREATING A PRESSURE GRADIENT RELATIVE TO THE REMAINDER OF SAID FORMATION AND THEREBY INCREASING THE SWEEP EFFICIENCY OF SAID SECOND INJECTED FLUID, AND DRIVING SAID SECOND INJECTED FLUID THROUGH SAID FORMATION TOWARD SAID PRODUCING WELL.
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |