Patent US2805990A successfully refreshed from Google Patents.
US2805990A
Expired / Lapsed
US
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Improved drilling mud and method of use
Assignee: Phillips Petroleum Co
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Filing: 1952-12-22
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Granted: 1957-09-10
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Expires: 1972-12-22
Abstract
No abstract record available.
Inventors
- 👤 William E Bergman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:29
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
IN A PROCESS FOR DRILLING A WELL WITH WELL DRILLING TOOLS WHEREIN THERE IS CIRCULATED IN THE WELL A WATER BASE DRILLING MUD CONTAINING COLLOIDAL PARTICLES OF CLAYEY MATERIAL SUSPENDED IN SUFFICIENT WATER TO RENDER THE SAME CIRCULATABLE, THE METHOD OF FORMING A FILTER CAKE ON THE WALL OF SAID WELL SO AS TO DECREASE THE LOSS OF FLUID FROM SAID DRILLING MUD CONTAINED THEREIN INTO SURROUNDING EARTHEN FORMATIONS WHICH COMPRISES ADMIXING WITH SAID DRILLING MUD A RUBBER LATEX IN AN AMOUNT AND A TOTAL SOLIDS CONCENTRATION SUFFICIENT SO AS TO LOWER THE FLUID LOSS THROUGH SAID FILTER CAKE AND TO MAINTAIN THE VISCOSITY OF SAID DRILLING MUD WITHIN DESIRED LIMITS AND CONTACTING SAID WALL OF SAID WELL WITH THE RESULTING DRILLING MUD SO AS TO FORM SAID FILTER CAKE THEREON.
Claim 2
Dependent Claim
131 words
IN A PROCESS FOR DRILLING A WELL WITH WELL DRILLING TOOLS WHEREIN THERE IS CIRCULATED IN THE WELL A WATER BASE DRILLING MUD CONTAINING COLLOIDAL PARTICLES OF CLAYEY MATERIAL SUSPENDED IN SUFFICIENT WATER TO RENDER THE SAME CIRCULATABLE, THE METHOD OF FORMING A FILTER CAKE ON THE WALL OF SAID WELL SO AS TO DECREASE THE LOSS OF FLUID FROM SAID DRILLING MUD CONTAINED THEREIN INTO SURROUNDING EARTHEN FORMATIONS WHICH COMPRISES ADMIXING WITH SAID DRILLING MUD A RUBBER LATEX IN AN AMOUNT AND A TOTAL SOLIDS CONCENTRATION SUFFICIENT SO AS TO LOWER THE FLUID LOSS THROUGH SAID FILTER CAKE AND TO MAINTAIN THE VISCOSITY OF SAID DRILLING MUD WITHIN DESIRED LIMITS AND CONTACTING SAID WALL OF SAID WELL WITH THE RESULTING DRILLING MUD SO AS TO FORM SAID FILTER CAKE THEREON.
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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) | 1960-09-09 | 1961-03-11 | 1961-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-09 | 1965-03-11 | 1965-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-09 | 1969-03-11 | 1969-09-10 | $7700.00 | Window Closed / Lapsed |