US3298436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of secondary oil recovery using surfactants formed in situ
Assignee: ExxonMobil Upstream Research Co
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Filing: 1964-10-30
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Granted: 1967-01-17
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Expires: 1984-10-30
Abstract
No abstract record available.
Inventors
- 👤 William M Mccardell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:54
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
68 words
THE METHOD OF RECOVERING PETROLEUM OIL FROM NATURL RESERVOIRS COMPRISING INJECTING THROUGH AN INJECTION WELL AND INTO THE OIL-CONTAINING FORMATION, A SOLUTION OF A FIRST REACTANT IN OIL PREVIOUSLY RECOVERED FROM SAID RESERVOIR, THEREAFTER INJECTING INTO THE RESERVOIR AN AQUEOUS SOLUTION OF A SECOND REACTANT CAPABLE OF REACTING WITH SAID FIRST REACTANT UNDER RESERVOIR CONDITIONS TO FOORM A SURFACTANT; SAID AQUEOUS SOLUTION DISPLACING OIL TO A PRODUCTION WELL.
References Cited (Backward Citations)
NL51278C
Cited
US3111984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |