US2744869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluid for high-temperature wells
Assignee: Shell Development Co
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Filing: 1953-11-23
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Granted: 1956-05-08
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Expires: 1973-11-23
Abstract
No abstract record available.
Inventors
- 👤 Henry C H Darley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:49
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/16; C09K8/26; C09K8/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A PROCESS FOR DRILLING A HIGH-TEMPERATURE WELL COMPRISING DRILLING THE WELL WITH WELL DRILLING TOOLS, CIRCULATING IN THE WELL A WATER-BASE LIME-FREE DRILLING MUD CONTAINING COLLOIDAL PARTICLES OF CLAYEY MATERIAL SUSPENDED IN SUFFICIENT WATER TO RENDER THE SAME CIRCULATABLE, AND INCREASING THE SOLIDS CAPACITY OF SAID DRILLING MUD BY ADMIXING WITH SAID MUD AND INTERACTING THEREWITH BARIUM HYDROXIDE IN AN AMOUNT OF FROM 1 TO 15 POUNDS PER BARREL IN EXCESS OF THAT WHICH WOULD REACT WITH ANY SULFATE IONS PRESENT IN THE MUD, SAID BARIUM HYDROXIDE BEING SUFFICIENT TO RAISE THE SOLIDS CAPACITY OF THE MUD AND PREVENT THE SOLIDIFICATIN THEREOF WHEN SAID MUD ARE EXPOSED TO TEMPERATURES ABOVE 110* C., SAID AMOUNT OF BARIUM HYDROXIDE BEING INSUFFICIENT TO INCREASE THE VISCOSITY OF SAID MUD TO SUCH AN EXTENT AS TO RENDER SAID DRILLING MUD UNCIRCULATABLE.
Claim 2
Dependent Claim
137 words
A PROCESS FOR DRILLING A HIGH-TEMPERATURE WELL COMPRISING DRILLING THE WELL WITH WELL DRILLING TOOLS, CIRCULATING IN THE WELL A WATER-BASE LIME-FREE DRILLING MUD CONTAINING COLLOIDAL PARTICLES OF CLAYEY MATERIAL SUSPENDED IN SUFFICIENT WATER TO RENDER THE SAME CIRCULATABLE, AND INCREASING THE SOLIDS CAPACITY OF SAID DRILLING MUD BY ADMIXING WITH SAID MUD AND INTERACTING THEREWITH BARIUM HYDROXIDE IN AN AMOUNT OF FROM 1 TO 15 POUNDS PER BARREL IN EXCESS OF THAT WHICH WOULD REACT WITH ANY SULFATE IONS PRESENT IN THE MUD, SAID BARIUM HYDROXIDE BEING SUFFICIENT TO RAISE THE SOLIDS CAPACITY OF THE MUD AND PREVENT THE SOLIDIFICATIN THEREOF WHEN SAID MUD ARE EXPOSED TO TEMPERATURES ABOVE 110* C., SAID AMOUNT OF BARIUM HYDROXIDE BEING INSUFFICIENT TO INCREASE THE VISCOSITY OF SAID MUD TO SUCH AN EXTENT AS TO RENDER SAID DRILLING MUD UNCIRCULATABLE.
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) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |