US2778427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acidizing wells
Assignee: Dow Chemical Co
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Filing: 1952-02-18
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Granted: 1957-01-22
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Expires: 1972-02-18
Abstract
No abstract record available.
Inventors
- 👤 Paul H Cardwell
- 👤 Parke D Muir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:20
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; C09K8/74; Y; Y10; Y10S; Y10S507/00; Y10S507/933
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IN A METHOD OF ACIDIZING AN EARTH FORMATION PENETRATED BY THE BORE OF A WELL THE STEPS WHICH CONSIST IN INJECTING INTO THE EARTH FORMATION THROUGH THE WELL BORE AN AQUEOUS SOLUTION CONTAINING FROM 2 TO 25 PERCENT BY WEIGHT OF HCL AND HAVING DISPERSED THEREIN FROM 0.65 TO 4 PERCENT BY WEIGHT OF A WATER-SOLUBLE CELLULOSE ETHER, AND THEREAFTER INJECTING INTO THE EARTH FORMATION BETWEEN 1 AND 25 TIMES AS MUCH IN VOLUME OF AN AQUEOUS SOLTIION CONTAINING FROM 2 TO 25 PERCENT OF HCL BY WEIGHT FREE FROM CELLULOSE ETHER.
Claim 2
Dependent Claim
92 words
IN A METHOD OF ACIDIZING AN EARTH FORMATION PENETRATED BY THE BORE OF A WELL THE STEPS WHICH CONSIST IN INJECTING INTO THE EARTH FORMATION THROUGH THE WELL BORE AN AQUEOUS SOLUTION CONTAINING FROM 2 TO 25 PERCENT BY WEIGHT OF HCL AND HAVING DISPERSED THEREIN FROM 0.65 TO 4 PERCENT BY WEIGHT OF A WATER-SOLUBLE CELLULOSE ETHER, AND THEREAFTER INJECTING INTO THE EARTH FORMATION BETWEEN 1 AND 25 TIMES AS MUCH IN VOLUME OF AN AQUEOUS SOLTIION CONTAINING FROM 2 TO 25 PERCENT OF HCL BY WEIGHT FREE FROM CELLULOSE ETHER.
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) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |