US3605893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary recovery process
Assignee: BP America Production Co
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Filing: 1969-11-28
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Granted: 1971-09-20
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Expires: 1989-11-28
Abstract
Abstract OIL IS RECOVERED FROM AN UNDERGROUND OIL-BEARING FORMATION BY INJECTING INTO THE FORMATION IN SEQUENCE THREE BATCHES OR SLUGS OF LIQUID. THESE ARE FIRST A LIQUID HYDROCARBON, SECOND, A MUTUAL SOLVENT FOR THE LIQUID HYDROCARBON AND WATER, AND, THIRD, WATER WITH INCREASED VISCOSITY. THE FINAL SLUG IS FOLLOWED BY ORDINARY DRIVE WATER. THE VISCOSITIES OF THE VISCOUS WATER SLUG AND HYDROCARBON LIQUID ARE INCREASED TO VALUES AT LEAST AS GREAT AS THE VISCOSITY OF THE MUTUAL SOLVENT. PREFEREBLY, THE HYDROCARBON LIQUID IS PROPANE OR BUTANE WITH VISCOSITY INCREASED BY THE ADDITION OF A SOLUTION OF POLYISOBUTYLENE IN A HYDROCARBON HAVING A HIGHER MOLECULAR WEIGHT THAN BUTANE.
Inventors
- 👤 Dwight L Dauben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:00
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |