US2793187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive oil-base drilling fluids
Assignee: Union Oil Company of California
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Filing: 1953-12-21
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Granted: 1957-05-21
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Expires: 1973-12-21
Abstract
No abstract record available.
Inventors
- 👤 Paul W Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:48
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
178 words
AN ELECTRICALLY CONDUCTIVE OIL-BASE DRILLING FLUID COMPRISING (1) A NORMALLY NON-CONDUCTIVE DRILLING FLUID INITIALLY PREPARED BY DISPERSING MINOR AMOUNTS OF WATER, AN HYDRATABLE CLAY, A WATER-DISPERSIBLE ALKALI-METAL SOAP AND AN ALKALINE CALCIUM COMPOUND IN MINERAL OIL, SAID DRILLING FLUID CONTAINING CALCIUM IN SUBSTANTIAL EXCESS OF THE AMOUNT CHEMICALLY EQUIVALENT TO SAID ALKALIMETAL SOAP; (2) BETWEEN ABOUT 0.5 AND ABOUT 3 PARTS BY WEIGHT OF AN ALKALI-METAL BICARBONATE PER PART BY WEIGHT OF SAID EXCESS OF CALCIUM CALCULATED AS CALCIUM OXIDE; (3) BETWEEN ABOUT 0.75 AND ABOUT 2 PARTS BY WEIGHT OF A CALCIUM COMPOUND SELECTED FROM THE CLASS CONSISTING OF CALCIUM OXIDE AND CALCIUM HYDROXIDE PER PART BY WEIGHT OF SAID ALKALI-METAL BICARBONATE; AND (4) BETWEEN ABOUT 3 PART AND ABOUT 10 PERCENT, BASED ON THE WEIGHT OF THE ENTIRE COMPOSITION, OF WATER; AND (5) SUFFICIENT OF AN ELECTROLYTE SELECTED FROM THE CLASS CONSISTING OF WATER-SOLUBLE METAL HYDROXIDES AND WATER-SOLUBLE METAL SALTS AND AN EMULSIFYING AGENT SELECTED FROM THE CLASS CONSISTING OF SULFATED OILS, SULFATED ALCOHOLS, ORGANIC SULFONATED, AND ALKALI-METAL SALTS THEREOF, TO RENDER THE COMPOSITION ELECTRICALLY CONDUCTIVE.
Claim 2
Dependent Claim
178 words
AN ELECTRICALLY CONDUCTIVE OIL-BASE DRILLING FLUID COMPRISING (1) A NORMALLY NON-CONDUCTIVE DRILLING FLUID INITIALLY PREPARED BY DISPERSING MINOR AMOUNTS OF WATER, AN HYDRATABLE CLAY, A WATER-DISPERSIBLE ALKALI-METAL SOAP AND AN ALKALINE CALCIUM COMPOUND IN MINERAL OIL, SAID DRILLING FLUID CONTAINING CALCIUM IN SUBSTANTIAL EXCESS OF THE AMOUNT CHEMICALLY EQUIVALENT TO SAID ALKALIMETAL SOAP; (2) BETWEEN ABOUT 0.5 AND ABOUT 3 PARTS BY WEIGHT OF AN ALKALI-METAL BICARBONATE PER PART BY WEIGHT OF SAID EXCESS OF CALCIUM CALCULATED AS CALCIUM OXIDE; (3) BETWEEN ABOUT 0.75 AND ABOUT 2 PARTS BY WEIGHT OF A CALCIUM COMPOUND SELECTED FROM THE CLASS CONSISTING OF CALCIUM OXIDE AND CALCIUM HYDROXIDE PER PART BY WEIGHT OF SAID ALKALI-METAL BICARBONATE; AND (4) BETWEEN ABOUT 3 PART AND ABOUT 10 PERCENT, BASED ON THE WEIGHT OF THE ENTIRE COMPOSITION, OF WATER; AND (5) SUFFICIENT OF AN ELECTROLYTE SELECTED FROM THE CLASS CONSISTING OF WATER-SOLUBLE METAL HYDROXIDES AND WATER-SOLUBLE METAL SALTS AND AN EMULSIFYING AGENT SELECTED FROM THE CLASS CONSISTING OF SULFATED OILS, SULFATED ALCOHOLS, ORGANIC SULFONATED, AND ALKALI-METAL SALTS THEREOF, TO RENDER THE COMPOSITION ELECTRICALLY CONDUCTIVE.
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) | 1960-05-20 | 1960-11-19 | 1961-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-20 | 1964-11-19 | 1965-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-20 | 1968-11-19 | 1969-05-21 | $7700.00 | Window Closed / Lapsed |