Patent US2779417A successfully refreshed from Google Patents.
US2779417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plugging well casing perforations
Assignee: Stanolind Oil and Gas Co
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Filing: 1954-02-15
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Granted: 1957-01-29
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Expires: 1974-02-15
Abstract
No abstract record available.
Inventors
- 👤 Jr Roscoe C Clark
- 👤 George C Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:43
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A METHOD OF PLUGGING A MULTIPLICITY OF SPACED PERFORATIONS IN A WELL CASING CONTAINING MUD AND TRAVERSING A PERMEABLE ZONE COMPRISING THE STEPS OF INTRODUCING INTO SAID CASING A SLURRY OF HYDRAULIC CEMENT HAVING BY WEIGHT, BASED ON THE WEIGHT OF CEMENT IN SAID SLURRY, ABOUT 1 PERCENT OF A CEMENT WATER-LOSS REDUCING ADDITIVE AND BETWEEN ABOUT 0.5 TO 10 PERCENT OF A PUMPABLE BRIDGING MATERIAL WHICH HAS A MAXIMUM DIMENSION OF ABOUT 0.1-1.5 INCHES, APPLYING PRESSURE TO SAID SLURRY THEREBY CAUSING IT TO DISPLAY THE MUD FROM SAID CASING INTO SAID PERIORATIONS, AND TO FLOW INTO AT LEAST SAOME OF SAID PERFORATIONS DEPOSITING A SHEATH OF SAID BRIDGING MATERIAL ON THE EXPOSED FACE OF ANY CREVICES IN SAID PERMEABLE ZONE AND PLUGGING SAME, SUCCESSIVELY FLOWING SAID SLURRY INTO ADDITIONAL PERFORATIONS AT PROGRESSIVELY HIGHER PRESSURES UNTIL SAID MUD HAS BEEN DISPLACED FROM ALL OF SAID PERFORATIONS AND HAS BEEN REPLACED WITH SAID SLURRY OF CEMENT, AND ALLOWING SAID CEMENT TO HYDRATE IN SAID PERFORATIONS.
Claim 2
Independent Claim
164 words
A METHOD OF PLUGGING A MULTIPLICITY OF SPACED PERFORATIONS IN A WELL CASING CONTAINING MUD AND TRAVERSING A PERMEABLE ZONE COMPRISING THE STEPS OF INTRODUCING INTO SAID CASING A SLURRY OF HYDRAULIC CEMENT HAVING BY WEIGHT, BASED ON THE WEIGHT OF CEMENT IN SAID SLURRY, ABOUT 1 PERCENT OF A CEMENT WATER-LOSS REDUCING ADDITIVE AND BETWEEN ABOUT 0.5 TO 10 PERCENT OF A PUMPABLE BRIDGING MATERIAL WHICH HAS A MAXIMUM DIMENSION OF ABOUT 0.1-1.5 INCHES, APPLYING PRESSURE TO SAID SLURRY THEREBY CAUSING IT TO DISPLAY THE MUD FROM SAID CASING INTO SAID PERIORATIONS, AND TO FLOW INTO AT LEAST SAOME OF SAID PERFORATIONS DEPOSITING A SHEATH OF SAID BRIDGING MATERIAL ON THE EXPOSED FACE OF ANY CREVICES IN SAID PERMEABLE ZONE AND PLUGGING SAME, SUCCESSIVELY FLOWING SAID SLURRY INTO ADDITIONAL PERFORATIONS AT PROGRESSIVELY HIGHER PRESSURES UNTIL SAID MUD HAS BEEN DISPLACED FROM ALL OF SAID PERFORATIONS AND HAS BEEN REPLACED WITH SAID SLURRY OF CEMENT, AND ALLOWING SAID CEMENT TO HYDRATE IN SAID PERFORATIONS.
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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) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |