US2800964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of lost circulation in a drilling well
Assignee: Pan American Petroleum Corp
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Filing: 1954-01-05
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Granted: 1957-07-30
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Expires: 1974-01-05
Abstract
No abstract record available.
Inventors
- 👤 David A Garrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:55
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN A PROCESS FOR RECOVERING CIRCULATION LOST IN A FORMATION PENETRATED BY A DRILLING WELL WHICH INCLUDES INJECTING INTO SAID WELL THROUGH A FIRST CONDUIT A NONAQUEOUS LIQUID SLURRY OF FINELY DIVIDED BENTONITE, INJECTING INTO SAID WELL THROUGH A SECOND CONDUIT AND AQUEOUS DRILLING FLUID, INTIMATELY MIXING SAID NON-AQUEOUS LIQUID SLURRY OF FINELY DIVIDED BENTONITE AND SAID AQUEOUS DRILLING FLUID WITHIN SAID WELL AT A DEPTH SUBSTANTIALLY AS GREAT AS THE DEPTH OF SAID FORMATION, THE AMOUNT OF SAID FINELY DIVIDED BETONITE BEING SUFFICIENT TO PRODUCE SUBSTANTIALLY INSTANTEOUSLY A PLASTIC PLUG TOO VISCOUS TO BE PUMPED, AND DISPLACING AT LEAST A PART OF SAID PLASTIC PLUG INTO SAID FORMATION,THE IMPROVEMENT COMPRISING ADDING TO ONE OF SAID NON-AQUEOUS LIQUID SLURRY OF FINELY DIVIDED BENTONITE
Claim 2
Dependent Claim
123 words
IN A PROCESS FOR RECOVERING CIRCULATION LOST IN A FORMATION PENETRATED BY A DRILLING WELL WHICH INCLUDES INJECTING INTO SAID WELL THROUGH A FIRST CONDUIT A NONAQUEOUS LIQUID SLURRY OF FINELY DIVIDED BENTONITE, INJECTING INTO SAID WELL THROUGH A SECOND CONDUIT AND AQUEOUS DRILLING FLUID, INTIMATELY MIXING SAID NON-AQUEOUS LIQUID SLURRY OF FINELY DIVIDED BENTONITE AND SAID AQUEOUS DRILLING FLUID WITHIN SAID WELL AT A DEPTH SUBSTANTIALLY AS GREAT AS THE DEPTH OF SAID FORMATION, THE AMOUNT OF SAID FINELY DIVIDED BETONITE BEING SUFFICIENT TO PRODUCE SUBSTANTIALLY INSTANTEOUSLY A PLASTIC PLUG TOO VISCOUS TO BE PUMPED, AND DISPLACING AT LEAST A PART OF SAID PLASTIC PLUG INTO SAID FORMATION,THE IMPROVEMENT COMPRISING ADDING TO ONE OF SAID NON-AQUEOUS LIQUID SLURRY OF FINELY DIVIDED BENTONITE
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) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |