US3208523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering lost circulation in drilling wells and fluid therefor
Assignee: Minerals and Chemicals Philipp Corp
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Filing: 1962-03-01
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Granted: 1965-09-28
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Expires: 1982-03-01
Abstract
No abstract record available.
Inventors
- 👤 Arthur I Coyle
- 👤 Jr Edgar W Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:09
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A METHOD FOR RECOVERING LOST CIRCULATION IN A DRILLING WELL WHICH COMPRISES PUMPING A HIGH WATER LOSS MUD INTO A WELL UNDER PRESSURE IN AMOUNT SUFFICIENT TO COVER A LOST CIRCULATION ZONE OF THE WELL FORMATION, WHEREBY A THICK WATER-PERMEABLE CAKE IS RAPIDLY DEPOSITED ON THE FACE OF SAID LOST CIRCULATION ZONE AS A RESULT OF LOSS OF WATER FROM SAID HIGH WATER LOSS MUD, SAID CAKE BEING ADAPTED FOR DEPOSITION THEREON OF A MUD CAKE RESISTANT TO WATER AND FLUID LOSS UPON INTRODUCTION OF CIRCULATING FLUID THERETO, SAID HIGH WATER LOSS MUD COMPRISING AN AQUEOUS DISPERSION OF COLLOIDAL ATTAPULGITE CLAY CONTAINING A SMALL QUANTITY OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF HYDRATABLE MGO AND MG(OH)2, AND HAVING SUSPENDED THEREIN SEALING MATERIAL AND MINUS 325 MESH PARTICLES OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF DIATOMACEOUS EARTH, EXPANDED PERLITE AND COLLOIDAL ATTAPULGITE CLAY WHICH HAS PREVIOUSLY BEEN DISPERSED IN WATER IN THE PRESENCE OF A DEFLOCCULATING AGENT, DRIED QUIESCENTLY AND THEN CALCINED.
Claim 2
Independent Claim
165 words
A METHOD FOR RECOVERING LOST CIRCULATION IN A DRILLING WELL WHICH COMPRISES PUMPING A HIGH WATER LOSS MUD INTO A WELL UNDER PRESSURE IN AMOUNT SUFFICIENT TO COVER A LOST CIRCULATION ZONE OF THE WELL FORMATION, WHEREBY A THICK WATER-PERMEABLE CAKE IS RAPIDLY DEPOSITED ON THE FACE OF SAID LOST CIRCULATION ZONE AS A RESULT OF LOSS OF WATER FROM SAID HIGH WATER LOSS MUD, SAID CAKE BEING ADAPTED FOR DEPOSITION THEREON OF A MUD CAKE RESISTANT TO WATER AND FLUID LOSS UPON INTRODUCTION OF CIRCULATING FLUID THERETO, SAID HIGH WATER LOSS MUD COMPRISING AN AQUEOUS DISPERSION OF COLLOIDAL ATTAPULGITE CLAY CONTAINING A SMALL QUANTITY OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF HYDRATABLE MGO AND MG(OH)2, AND HAVING SUSPENDED THEREIN SEALING MATERIAL AND MINUS 325 MESH PARTICLES OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF DIATOMACEOUS EARTH, EXPANDED PERLITE AND COLLOIDAL ATTAPULGITE CLAY WHICH HAS PREVIOUSLY BEEN DISPERSED IN WATER IN THE PRESENCE OF A DEFLOCCULATING AGENT, DRIED QUIESCENTLY AND THEN CALCINED.
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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |