US2877848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for cleaning permeable formations
Assignee: Gulf Oil Corp
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Filing: 1956-06-11
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Granted: 1959-03-17
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Expires: 1976-06-11
Abstract
No abstract record available.
Inventors
- 👤 Leslie C Case
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:03
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/528; Y; Y10; Y10S; Y10S507/00; Y10S507/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A PROCESS FOR CLEANING A WELL WHICH HAS BECOME AT LEAST PARTIALLY PLUGGED BY THE DEPOSITION OF WATER-INSOLUBLE SOLIDS IN THE PERMEABLE FORMATION ADJACENT THE BOREHOLE OF THE WELL THROUGH WHICH LIQUIDS PASS DURING OPERATION OF THE WELL CONSISTING ESSENTIALLY OF DISPLACING AN AQUEOUS SOLUTION CONTAINING ABOUT 1 TO 10% OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ETHYLENE DIAMINE TETRAACETIC ACID, AN ALKALI METAL SALT OF ETHYLENE DIAMINE TETRAACETIC ACID, A SUBSTITUTED ETHYLENE DIAMINE TETRAACETIC ACID, AN ALKALI METAL SALT OF A SUBSTITUTED ETHYLENE DIAMINE TETRAACETIC ACID, ETHYLENE DIAMINE TRIACETIC ACID, AND AN ALKALI METAL SALT OF A SUBSTITUTED ETHYLENE DIAMINE TRIACETIC ACID DOWN THE WELL AND INTO THE PERMEABLE FORMATION ADJACENT THE BOREHOLE OF THE WELL; MAINTAINING SAID AQUEOUS SOLUTION IN CONTACT WITH THE SOLIDS PLUGGING THE FORMATION FOR A PERIOD OF AT LEAST ABOUT 1 HOUR SUFFICIENT TO SOLUBILIZE SAID SOLIDS; AND REMOVING SOLUBILIZED SOLIDS FROM THE PERMEABLE FORMATION ADJACENT THE BOREHOLE OF THE WELL.
Claim 2
Dependent Claim
159 words
A PROCESS FOR CLEANING A WELL WHICH HAS BECOME AT LEAST PARTIALLY PLUGGED BY THE DEPOSITION OF WATER-INSOLUBLE SOLIDS IN THE PERMEABLE FORMATION ADJACENT THE BOREHOLE OF THE WELL THROUGH WHICH LIQUIDS PASS DURING OPERATION OF THE WELL CONSISTING ESSENTIALLY OF DISPLACING AN AQUEOUS SOLUTION CONTAINING ABOUT 1 TO 10% OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ETHYLENE DIAMINE TETRAACETIC ACID, AN ALKALI METAL SALT OF ETHYLENE DIAMINE TETRAACETIC ACID, A SUBSTITUTED ETHYLENE DIAMINE TETRAACETIC ACID, AN ALKALI METAL SALT OF A SUBSTITUTED ETHYLENE DIAMINE TETRAACETIC ACID, ETHYLENE DIAMINE TRIACETIC ACID, AND AN ALKALI METAL SALT OF A SUBSTITUTED ETHYLENE DIAMINE TRIACETIC ACID DOWN THE WELL AND INTO THE PERMEABLE FORMATION ADJACENT THE BOREHOLE OF THE WELL; MAINTAINING SAID AQUEOUS SOLUTION IN CONTACT WITH THE SOLIDS PLUGGING THE FORMATION FOR A PERIOD OF AT LEAST ABOUT 1 HOUR SUFFICIENT TO SOLUBILIZE SAID SOLIDS; AND REMOVING SOLUBILIZED SOLIDS FROM THE PERMEABLE FORMATION ADJACENT THE BOREHOLE OF THE WELL.
References Cited (Backward Citations)
US2238930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |