US3703928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil recovery utilizing acidic organic phosphate scale inhibitors
Assignee: Cities Service Oil Co
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Filing: 1971-02-24
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Granted: 1972-11-28
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Expires: 1991-02-24
Abstract
Abstract Disclosed herein is a method for the reduction of scale deposition in a formation and fractures about a producing wellbore. In particular, an acidic organic phosphate scale inhibitor is introduced into a waterflooding medium so as to lower the pH of the injection waters, treat the formation and allow the scale inhibitor and water to reach the production well wherein subsequent production from the formation, through the fractures prevents scale deposition.
Inventors
- 👤 Richard S Fulford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:26
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/528; C09K8/58; C09K8/594; E; E21; E21B; E21B43/00; E21B43/16; E21B43/164; C09K2208/00; C09K2208/22; Y; Y10; Y10S; Y10S507/00; Y10S507/927
Claims Analysis
Total Claims: 0
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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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |