US2990016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and composition for sealing lost circulation in wells
Assignee: Gulf Oil Corp
•
Filing: 1957-02-26
•
Granted: 1961-06-27
•
Expires: 1977-02-26
Abstract
No abstract record available.
Inventors
- 👤 Jr William C Goins
- 👤 Jr John L Burba
- 👤 Jr David D Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:34
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR SEALING A ZONE OF CIRCULATION LOSS INTO AN INCOMPETENT FORMATION ENCOUNTERED IN DRILLING A WELL COMPRISING PUMPING A SLURRY OF A NON-AQUEOUS LIQUID AND HYDRATABLE MATERIAL DOWN THE WELL THROUGH ONE CHANNEL INTO THE BOREHOLE SLIGHTLY ABOVE THE ZONE OF CIRCULATION LOSS, THE CONCENTRATION OF HYDRATABLE MATERIAL IN SAID SLURRY BEING BETWEEN ABOUT 100 POUNDS PER BARREL OF NONAQUEOUS LIQUID AND THE MAXIMUM CONCENTRATION ALLOWING A SLURRY TO BE PUMPABLE, SIMULTANEOUSLY PUMPING AN AQUEOUS LIQUID DOWN THE WELL THROUGH A SEPARATE CHANNEL INTO THE BOREHOLE SLIGHTLY ABOVE THE ZONE OF CIRCULATION LOSS, THE RATIO OF SLURRY TO AQUEOUS LIQUID BEING BETWEEN A MAXIMUM OF 10:1 AND A MINIMUM EQUAL TO THE
Claim 2
Dependent Claim
114 words
A PROCESS FOR SEALING A ZONE OF CIRCULATION LOSS INTO AN INCOMPETENT FORMATION ENCOUNTERED IN DRILLING A WELL COMPRISING PUMPING A SLURRY OF A NON-AQUEOUS LIQUID AND HYDRATABLE MATERIAL DOWN THE WELL THROUGH ONE CHANNEL INTO THE BOREHOLE SLIGHTLY ABOVE THE ZONE OF CIRCULATION LOSS, THE CONCENTRATION OF HYDRATABLE MATERIAL IN SAID SLURRY BEING BETWEEN ABOUT 100 POUNDS PER BARREL OF NONAQUEOUS LIQUID AND THE MAXIMUM CONCENTRATION ALLOWING A SLURRY TO BE PUMPABLE, SIMULTANEOUSLY PUMPING AN AQUEOUS LIQUID DOWN THE WELL THROUGH A SEPARATE CHANNEL INTO THE BOREHOLE SLIGHTLY ABOVE THE ZONE OF CIRCULATION LOSS, THE RATIO OF SLURRY TO AQUEOUS LIQUID BEING BETWEEN A MAXIMUM OF 10:1 AND A MINIMUM EQUAL TO THE
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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) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |