Patent US2939839A successfully refreshed from Google Patents.
US2939839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well packer fluid
Assignee: Texaco Inc
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Filing: 1957-12-06
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Granted: 1960-06-07
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Expires: 1977-12-06
Abstract
No abstract record available.
Inventors
- 👤 John S Brukner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:40
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; Y; Y10; Y10S; Y10S507/00; Y10S507/926
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN A DRILLING OPERATION WHEREIN AN AQUEOUS DRILLING MUD WHICH CONTAINS AN AQUEOUS PHASE SATURATED WITH RESPECT TO CALCIUM HYDROXIDE IS EMPLOYED DURING THE DRILLING OPERATION AND WHEREIN A PORTION OF SAID AQUEOUS DRILLING MUD IS LEFT IN THE BORE HOLE AS A PACKER FLUID, THE IMPROVEMENT WHICH COMPRISES ADDING TO SAID PORTION OF SAID AQUEOUS DRILLING MUD MINOR AMOUNT IN THE RANGE 0.0110% BY WEIGHT BASED ON SAID MUD OF A WATER SOLUBLE ORGANIC OXYGEN-CONTAINING SILICON COMPOUND AND A WATER SOLUBLE METAL SALT WHICH REACTS WITH THE CALCIUM HYDROXIDE DISSOLVED IN SAID AQUEOUS PHASE TO FORM A SUBSTANTIALLY WATER INSOLUBLE METAL HYDROXIDE, SAID METAL SALT BEING ADDED IN AMOUNT SUFFICIENT TO PRECIPITATE SUBSTANTIALLY ALL OF SAID CALCIUM HYDROXIDE IN SAID PORTION OF SAID DRILLING MUD.
Claim 2
Dependent Claim
126 words
IN A DRILLING OPERATION WHEREIN AN AQUEOUS DRILLING MUD WHICH CONTAINS AN AQUEOUS PHASE SATURATED WITH RESPECT TO CALCIUM HYDROXIDE IS EMPLOYED DURING THE DRILLING OPERATION AND WHEREIN A PORTION OF SAID AQUEOUS DRILLING MUD IS LEFT IN THE BORE HOLE AS A PACKER FLUID, THE IMPROVEMENT WHICH COMPRISES ADDING TO SAID PORTION OF SAID AQUEOUS DRILLING MUD MINOR AMOUNT IN THE RANGE 0.0110% BY WEIGHT BASED ON SAID MUD OF A WATER SOLUBLE ORGANIC OXYGEN-CONTAINING SILICON COMPOUND AND A WATER SOLUBLE METAL SALT WHICH REACTS WITH THE CALCIUM HYDROXIDE DISSOLVED IN SAID AQUEOUS PHASE TO FORM A SUBSTANTIALLY WATER INSOLUBLE METAL HYDROXIDE, SAID METAL SALT BEING ADDED IN AMOUNT SUFFICIENT TO PRECIPITATE SUBSTANTIALLY ALL OF SAID CALCIUM HYDROXIDE IN SAID PORTION OF SAID DRILLING MUD.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |