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Patent US2497398A successfully refreshed from Google Patents.
US2497398A
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Oil base drilling fluid
Assignee: Shell Development Co
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Filing: 1947-05-24
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Granted: 1950-02-14
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Expires: 1967-05-24
Abstract
No abstract record available.
Inventors
- 👤 Reginald D Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:49
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; C09K8/36; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
109 words
A DRILLING FLUID FOR USE IN A WELL; CONTAINING AN EMULSION OF WATER IN OIL, AN AMOUNT OF FINELY DIVIDED SOLID MATERIAL DISPERSED THEREIN, SAID AMOUNT BEING SUFFICIENT TO PERMIT THE DRILLING FLUID TO OVERCOME THE PRESSURE OF THE WELL, AND AN AMOUNT OF REACTION PRODUCTS OF FROM 0.5% TO 5.0% BY WEIGHT OF THE TOTAL EMULSION OF AN ALKALI SALT OF AN ORGANIC CARBOXY ACID AND FROM 0.5% TO 2.0% BY WEIGHT OF THE TOTAL EMULSION OF A WATER SOLUBLE SALT OF A POLYVALENT METAL, SAID AMOUNT BEING SUFFICIENT TO STABILIZE SAID EMULSION AND TO SUBSTANTIALLY IMPROVE ITS PROPERTIES AS MEDIUM FOR THE ELECTRICAL LOGGING OF THE WELL.
References Cited (Backward Citations)
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US2144808A
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US2217926A
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US2216955A
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US2297660A
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US2360992A
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US2430039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |