US3028913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovering lost circulation in wells
Assignee: Individual
•
Filing: 1957-02-04
•
Granted: 1962-04-10
•
Expires: 1977-02-04
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Armentrout
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:41
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/504; C09K8/5045; Y; Y10; Y10S; Y10S507/00; Y10S507/902
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
122 words
THE METHOD OF RECOVERING LOST CIRCULATION IN A WELL WHICH INCLUDES INTRODUCING INTO THE WELL AND TRANSMITTING TO THE LOCATION WHERE CIRCULATION IS BEING LOST, A PUMPABLE AQUEOUS MIXTURE CONTAINING HYDRATABLE CLAY MATERIAL AND AN INHIBITOR DESIGNED TO RENDER THE MATERIAL TEMPORARILY HYDROPHOBIC, AND AN ACCELERATOR DESIGNED TO COUNTERACT AND A SUFFICIENT QUANTITY TO COUNTERACT THE EFFECT OF THE INHIBITOR AND RENDER THE CLAY MATERIAL HYDROPHILIC THE ACCELERATOR BEING IN A FORM SUCH THAT ITS EXPOSED SURFACE IS SMALL PER UNIT OF VOLUME, TRANSMITTING THESE CIRCUMSTANCES TO THE LOCATION WHERE CIRCULATION IS BEING LOST AND ALLOWING WELL CONDITIONS TO BECOME STATIC WHEREBY NO GREAT VOLUME OF THE ACCELERATOR WILL BE DISSOLVED OR DISPERSED DURING TRANSIT BUT WITH THE PASSAGE OF TIME, WHILE
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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) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |