Patent US2376475A successfully refreshed from Google Patents.
US3036631A
Expired / Lapsed
US
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Water-flooding process
Assignee: Pure Oil Co
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Filing: 1959-02-19
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Granted: 1962-05-29
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Expires: 1979-02-19
Abstract
No abstract record available.
Inventors
- 👤 Orrin C Holbrook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:00
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A METHOD FOR PRODUCING OIL FROM UNDERGROUND RESERVOIRS PENETRATED BY AN INPUT WELL AND AN OUTPUT WELL COMPRISING SHUTTING IN SAID OUTPUT WELL, INJECTING AN OXYGEN-CONTAINING GAS THROUGH SAID INPUT WELL AND INTO SAID FORMATION AT AN INJECTION PRESSURE IN THE RANGE OF 100-500 P.S.I AND IN THE AMOUNT OF AT LEAST 0.1 RESERVOIR PORE VOLUME, THEN REDUCING THE RATE OF INJECTION OF SAID GAS TO A RATE SUFFICIENT TO MAINTAIN THE PRESSURE OF THE INJECTED GAS WITHIN SAID RANGE, MAINTAINING SAID GAS PRESSURE FOR A PERIOD OF AT LEAST TWO MONTHS TO PARTIALLY OXIDIZE A PORTION OF THE OIL IN THE RESERVOIR, THEN INJECTING AN AQUEOUS SOLUTION OF SODIUM HYDROXIDE INTO THE RESERVOIR THROUGH SAID INJECTION WELL TO REACT WITH THE PARTIALLY OXIDIZED OIL PORTION, DRIVING SAID SOLUTION THROUGH THE RESERVIOR BY INJECTING FLOOD WATER THROUGH SAID INJECTION WELL, AND OPENING SAID OUTPUT WELL AND PRODUCING OIL THEREFROM.
Claim 2
Independent Claim
149 words
A METHOD FOR PRODUCING OIL FROM UNDERGROUND RESERVOIRS PENETRATED BY AN INPUT WELL AND AN OUTPUT WELL COMPRISING SHUTTING IN SAID OUTPUT WELL, INJECTING AN OXYGEN-CONTAINING GAS THROUGH SAID INPUT WELL AND INTO SAID FORMATION AT AN INJECTION PRESSURE IN THE RANGE OF 100-500 P.S.I AND IN THE AMOUNT OF AT LEAST 0.1 RESERVOIR PORE VOLUME, THEN REDUCING THE RATE OF INJECTION OF SAID GAS TO A RATE SUFFICIENT TO MAINTAIN THE PRESSURE OF THE INJECTED GAS WITHIN SAID RANGE, MAINTAINING SAID GAS PRESSURE FOR A PERIOD OF AT LEAST TWO MONTHS TO PARTIALLY OXIDIZE A PORTION OF THE OIL IN THE RESERVOIR, THEN INJECTING AN AQUEOUS SOLUTION OF SODIUM HYDROXIDE INTO THE RESERVOIR THROUGH SAID INJECTION WELL TO REACT WITH THE PARTIALLY OXIDIZED OIL PORTION, DRIVING SAID SOLUTION THROUGH THE RESERVIOR BY INJECTING FLOOD WATER THROUGH SAID INJECTION WELL, AND OPENING SAID OUTPUT WELL AND PRODUCING OIL THEREFROM.
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) | 1965-05-28 | 1965-11-27 | 1966-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-28 | 1969-11-27 | 1970-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-28 | 1973-11-27 | 1974-05-29 | $7700.00 | Window Closed / Lapsed |