Patent US565539A successfully refreshed from Google Patents.
Patent US3753903A successfully refreshed from Google Patents.
US3753903A
Expired / Lapsed
US
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Well completion and workover fluid
Assignee: Union Oil Company of California
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Filing: 1971-04-28
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Granted: 1973-08-21
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Expires: 1991-04-28
Abstract
Abstract A NON-DAMAGING WELL COMPLETION AND WORKOVER FLUID IS DISCLOSED. THE FLUID COMPRISES A DISPERSION OF FINELY DIVIDED SOLID WAX PARTICLES AND FINELY DIVIDED SOLID PARTICLES OF A WATER-INSOLUBLE, ACID-SOLUBLE INORGANIC MATERIAL IN AN AQUEOUS SALT SOLUTION CONTAINING ESPECIALLY SELECTED EMULSIFIERS. THE DENSITY OF THE FLUID IS CONTROLLED BY VARYING THE CONCENTRATION OF DISSOLVED SALTS, AND THE VISCOSITY CAN BE INCREASED BY THE ADDITION OF HYDROXY ETHYL CELLULOSE. A SMALL AMOUNT OF LIQUID HYDROCARBON CAN BE TO IMPROVE THE FLUID LOSS PROPERTIES OF THE FLUID.
Inventors
- 👤 P Fischer
- 👤 J Gallus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:09
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/92; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; Y; Y10; Y10S; Y10S507/00; Y10S507/925
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |