US3346047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multistage waterflood
Assignee: Mobil Oil AS
•
Filing: 1965-08-19
•
Granted: 1967-10-10
•
Expires: 1985-08-19
Abstract
No abstract record available.
Inventors
- 👤 Harold L Townsend
- 👤 James M Mcmillen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:19
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
IN A METHOD OF RECOVERING OIL FROM AN OIL-CONTAINING SUBTERRANEAN FORMATION WHEREIN A FLUID IS INJECTED INTO AN INJECTION MEANS AND INTO SAID FORMATION, AND OIL IS PRODUCED THEREFROM THROUGH A PRODUCTION MEANS, THE IMPROVEMENT COMPRISING THE STEPS OF: (A) INJECTING THROUGH SAID INJECTION MEANS A FIRST SLUG OF FROM 0.01 TO 10 PERCENT PORE VOLUME OF AN AQUEOUS NONSALINE SOLUTION CONTAINING A FIRST CONCENTRATION OF A SURFACTANT WHICH IS PARTIALLY WATER SOLUBLE AND PERFERENTIALLY OIL SOLUBLE; (B) INJECTING THROUGH SAID INJECTION MEANS A SECOND SLUG OF FROM 0.01 TO 10 PERCENT PORE VOLUME OF AN AQUEOUS SALINE SOLUTION CONTAINING A SECOND CONCENTRATION LOWER THAN SAID FIRST CONCENTRATION OF SAID SURFACTANT, SAID FIRST CONCENTRATION BEING AT LEAST AS HIGH AS THE SATURATION CONCENTRATION FOR SAID SURFACTANT IN SAID SALINE SOLUTION; AND (E) INJECTING THROUGH SAID INJECTION MEANS A THIRD SLUG OF AT LEAST 5.0 PERCENT PORE VOLUME OF BRINE TO DRIVE SAID NONSALINE SOLUTION, SAID SALINE SOLUTION, AND SAID OIL TOWARD AND PRODUCTION MEANS.
Claim 2
Dependent Claim
164 words
IN A METHOD OF RECOVERING OIL FROM AN OIL-CONTAINING SUBTERRANEAN FORMATION WHEREIN A FLUID IS INJECTED INTO AN INJECTION MEANS AND INTO SAID FORMATION, AND OIL IS PRODUCED THEREFROM THROUGH A PRODUCTION MEANS, THE IMPROVEMENT COMPRISING THE STEPS OF: (A) INJECTING THROUGH SAID INJECTION MEANS A FIRST SLUG OF FROM 0.01 TO 10 PERCENT PORE VOLUME OF AN AQUEOUS NONSALINE SOLUTION CONTAINING A FIRST CONCENTRATION OF A SURFACTANT WHICH IS PARTIALLY WATER SOLUBLE AND PERFERENTIALLY OIL SOLUBLE; (B) INJECTING THROUGH SAID INJECTION MEANS A SECOND SLUG OF FROM 0.01 TO 10 PERCENT PORE VOLUME OF AN AQUEOUS SALINE SOLUTION CONTAINING A SECOND CONCENTRATION LOWER THAN SAID FIRST CONCENTRATION OF SAID SURFACTANT, SAID FIRST CONCENTRATION BEING AT LEAST AS HIGH AS THE SATURATION CONCENTRATION FOR SAID SURFACTANT IN SAID SALINE SOLUTION; AND (E) INJECTING THROUGH SAID INJECTION MEANS A THIRD SLUG OF AT LEAST 5.0 PERCENT PORE VOLUME OF BRINE TO DRIVE SAID NONSALINE SOLUTION, SAID SALINE SOLUTION, AND SAID OIL TOWARD AND PRODUCTION MEANS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |