US3228469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preventing and curing lost circulation
Assignee: Atlantic Richfield Co
•
Filing: 1962-12-17
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Granted: 1966-01-11
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Expires: 1982-12-17
Abstract
No abstract record available.
Inventors
- 👤 Loyd R Kern
- 👤 Thomas K Perkins
- 👤 Thomas F Moore
- 👤 Jr William J Mcguire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:14
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/516
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
DURING EARTH WELL BORE DRILLING, A PROCESS FOR CURING A LOST CIRCULATION ZONE IN A SUBSURFACE EARTH FORMATION COMPRISING INJECTING INTO SAID WELL BORE A PREDETERMINED VOLUME OF A LOST CIRCULATION CONTROL MIXTURE OF A FLUID AND SOLID PARTICLES, SAID MIXTURE HAVING A FILTER CAKE TEST THICKNESS OF AT LEAST 4.0 INCHES IN A 30 MINUTE MODIFIED API TEST SO AS TO FORM A THICK FILTER CAKE IN SAID LOST CIRCULATION ZONE, SAID FILTER CAKE BEING SUFFICIENTLY PERMEABLE TO ALLOW ADDED AMOUNTS OF FILTER CAKE FROM SAID MIXTURE TO BE DEPOSITED ON AND DEHYDRATED THROUGH THE FILTER CAKE ALREADY DEPOSITED IN SAID LOST CIRCULATION ZONE, FORCING AT TIME SPACED INTERVALS DISCRETE VOLUMES OF SAID LOST CIRCULATION CONTROL MIXTURE INTO SAID LOST CIRCULATION ZONE, EACH OF SAID DISCRETE VOLUMES BEING SEPARATED BY AN INTERVAL OF AT LEAST 15 MINUTES DURATION, AND CONTINUATION SAID DISCRETE VOLUMES UNTIL THE PRESSURE EXERTED BY SAID LOST CIRCULATION CONTROL MIXTURE ON SAID LOST CIRCULATION ZONE EXCEEDS A PREDETERMINED PRESSURE.
Claim 2
Dependent Claim
163 words
DURING EARTH WELL BORE DRILLING, A PROCESS FOR CURING A LOST CIRCULATION ZONE IN A SUBSURFACE EARTH FORMATION COMPRISING INJECTING INTO SAID WELL BORE A PREDETERMINED VOLUME OF A LOST CIRCULATION CONTROL MIXTURE OF A FLUID AND SOLID PARTICLES, SAID MIXTURE HAVING A FILTER CAKE TEST THICKNESS OF AT LEAST 4.0 INCHES IN A 30 MINUTE MODIFIED API TEST SO AS TO FORM A THICK FILTER CAKE IN SAID LOST CIRCULATION ZONE, SAID FILTER CAKE BEING SUFFICIENTLY PERMEABLE TO ALLOW ADDED AMOUNTS OF FILTER CAKE FROM SAID MIXTURE TO BE DEPOSITED ON AND DEHYDRATED THROUGH THE FILTER CAKE ALREADY DEPOSITED IN SAID LOST CIRCULATION ZONE, FORCING AT TIME SPACED INTERVALS DISCRETE VOLUMES OF SAID LOST CIRCULATION CONTROL MIXTURE INTO SAID LOST CIRCULATION ZONE, EACH OF SAID DISCRETE VOLUMES BEING SEPARATED BY AN INTERVAL OF AT LEAST 15 MINUTES DURATION, AND CONTINUATION SAID DISCRETE VOLUMES UNTIL THE PRESSURE EXERTED BY SAID LOST CIRCULATION CONTROL MIXTURE ON SAID LOST CIRCULATION ZONE EXCEEDS A PREDETERMINED PRESSURE.
References Cited (Backward Citations)
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US2308425A
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Cited
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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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |