US3572433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Through tubing cementing plug apparatus
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1969-05-08
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Granted: 1971-03-23
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Expires: 1989-05-08
Abstract
Abstract THE METHOD OF CEMENTING A POROUS SUBSURFACE EARTH FORMATION IN WHICH WELL CASING IS SET AND PERFORATED, WHEREIN A BODY OF CEMENT SLURRY IS DISPLACED THROUGH THE TUBING, AND A BRIDGE PLUG IS EMPLOYED TO CLOSE OFF THE LOWER END OF THE TUBING, FOLLOWING DISPLACEMENT OF THE CEMENT SLURRY THROUGH THE PERFORATIONS. A BRIDGE PLUG FOR USE IN PERFORMING SUCH A METHOD, SUCH BRIDGE PLUG HAVING ANCHOR SLIPS RELEASABLY EXPANDABLE INTO ENGAGEMENT WITH THE TUBING WHEN AN EXPANSIBLE SPRING DEVICE AT THE LOWER END OF THE PLUG EMERGES FROM THE LOWER END OF THE TUBING.
Inventors
- 👤 Martin B Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:27
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/134
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |