US3005773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous drilling fluid
Assignee: Sunoco Inc
•
Filing: 1958-04-11
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Granted: 1961-10-24
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Expires: 1978-04-11
Abstract
No abstract record available.
Inventors
- 👤 Robert B Allred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:23
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
AN AQUEOUS DRILLING FLUID HAVING IMPROVED RESISTANCE TO THICKENING UNDER HIGH TEMPERATURE WELL CONDITIONS WHICH COMPRISES AN AQUEOUS DISPERSION OF A HYDRATABLE CLAY, 1-15 LBS./BBL. OF AN ALKALINE EARTH METAL COMPOUND HAVING WATER SOLUBILITY AT LEAST AS MUCH AS THAT OF LIME AND A CLAY DISPERSANT OBTAINED PRIOR TO INCORPORATION IN THE DRILLING FLUID BY HEAT TREATING AN AQUEOUS MIXTURE OF PYROGALLOL AND AT LEAST AN EQUIVALENT MOLAR AMOUNT OF AN ALKALI METAL HYDROXIDE IN THE PRESENCE OF IRON AT A TEMPERATURE OF AT LEAST 225*F. FOR A TIME OF AT LEAST 1 HOUR, SAID DISPERSANT BEING PRESENT IN AMOUNT SUFFICIENT TO INHIBIT THICKENING OF THE MIXTURE UNDER HIGH TEMPERATURE WELL CONDITIONS.
Claim 2
Dependent Claim
112 words
AN AQUEOUS DRILLING FLUID HAVING IMPROVED RESISTANCE TO THICKENING UNDER HIGH TEMPERATURE WELL CONDITIONS WHICH COMPRISES AN AQUEOUS DISPERSION OF A HYDRATABLE CLAY, 1-15 LBS./BBL. OF AN ALKALINE EARTH METAL COMPOUND HAVING WATER SOLUBILITY AT LEAST AS MUCH AS THAT OF LIME AND A CLAY DISPERSANT OBTAINED PRIOR TO INCORPORATION IN THE DRILLING FLUID BY HEAT TREATING AN AQUEOUS MIXTURE OF PYROGALLOL AND AT LEAST AN EQUIVALENT MOLAR AMOUNT OF AN ALKALI METAL HYDROXIDE IN THE PRESENCE OF IRON AT A TEMPERATURE OF AT LEAST 225*F. FOR A TIME OF AT LEAST 1 HOUR, SAID DISPERSANT BEING PRESENT IN AMOUNT SUFFICIENT TO INHIBIT THICKENING OF THE MIXTURE UNDER HIGH TEMPERATURE WELL CONDITIONS.
References Cited (Backward Citations)
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US2771420A
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-23 | 1965-04-24 | 1965-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-23 | 1969-04-24 | 1969-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-23 | 1973-04-24 | 1973-10-24 | $7700.00 | Window Closed / Lapsed |