Patent US2763326A successfully refreshed from Google Patents.
US2763326A
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Method and composition for acidizing wells
Assignee: Dow Chemical Co
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Filing: 1952-02-18
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Granted: 1956-09-18
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Expires: 1972-02-18
Abstract
No abstract record available.
Inventors
- 👤 Paul H Cardwell
- 👤 Alfred R Hendrickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:26
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
75 words
IN A METHOD OF ACIDIZING A WELL IN A CALCAREOUS FORMATION HAVING A TEMPERATURE OF AT LEAST 150* F. THE STEP WHICH CONSISTS IN INJECTING INTO THE EARTH FORMATION THROUGH THE WELL AN AQUEOUS HYDROCHLORIC ACID SOLUTION HAVING DISPERSED THEREIN AT LEAST 1.0 PER CENT BY WEIGHT OF POLYACRYLIC ACID, SAID SOLUTION CONTAINING FROM 2 TO 25 PER CENT OF HCL BY WEIGHT AND HAVING A VISCOSITY OF AT LEAST 50 CENTIPOISES AT 150* F.
Claim 2
Dependent Claim
75 words
IN A METHOD OF ACIDIZING A WELL IN A CALCAREOUS FORMATION HAVING A TEMPERATURE OF AT LEAST 150* F. THE STEP WHICH CONSISTS IN INJECTING INTO THE EARTH FORMATION THROUGH THE WELL AN AQUEOUS HYDROCHLORIC ACID SOLUTION HAVING DISPERSED THEREIN AT LEAST 1.0 PER CENT BY WEIGHT OF POLYACRYLIC ACID, SAID SOLUTION CONTAINING FROM 2 TO 25 PER CENT OF HCL BY WEIGHT AND HAVING A VISCOSITY OF AT LEAST 50 CENTIPOISES AT 150* F.
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) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |