Patent US2721174A successfully refreshed from Google Patents.
US2721174A
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Emulsified acids for high temperature wells
Assignee: Stanolind Oil and Gas Co
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Filing: 1952-09-06
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Granted: 1955-10-18
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Expires: 1972-09-06
Abstract
No abstract record available.
Inventors
- 👤 Jr Harold W Brainerd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:22
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/64; Y; Y10; Y10S; Y10S507/00; Y10S507/922; Y10S507/923
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
AN ACID-TO-OIL EMULSION FOR USE IN WELLS COMPRISING FROM ABOUT 85 TO 99 PARTS BY VOLUME OF AN AQUEOUS PHASE CONTAINING FROM ABOUT 5 TO 20 PER CENT BY WEIGHT OF A WATER-SOLUBLE ACID, FROM ABOUT 1 TO 15 PARTS BY VOLUME OF AN OIL, AND FROM 0.5 TO 10 PER CENT BY WEIGHT, BASED ON THE EMULSION, OF AN EMULSIFYING AGENT WITH THE FORMULA RXW WHEREIN W IS A WATER-SOLUBLE PORTION SELECTED FROM THE GROUP CONSISTING OF POLYGLYCOL AND POLYGLYCEROL RADICALS CONTAINING FROM 1 TO 3 ETHER LINKAGES, X IS AN ETHER-TYPE LINKAGE SELECGTED FROM THE GROUP CONSISTING OF OXYGEN AND SULFUR, AND R IS AN OIL-SOLUBLE, INERT, ESTER-FREE, ORGANIC PORTION CONTAINING AT LEAST 12 CARBON ATOMS.
Claim 2
Dependent Claim
118 words
AN ACID-TO-OIL EMULSION FOR USE IN WELLS COMPRISING FROM ABOUT 85 TO 99 PARTS BY VOLUME OF AN AQUEOUS PHASE CONTAINING FROM ABOUT 5 TO 20 PER CENT BY WEIGHT OF A WATER-SOLUBLE ACID, FROM ABOUT 1 TO 15 PARTS BY VOLUME OF AN OIL, AND FROM 0.5 TO 10 PER CENT BY WEIGHT, BASED ON THE EMULSION, OF AN EMULSIFYING AGENT WITH THE FORMULA RXW WHEREIN W IS A WATER-SOLUBLE PORTION SELECTED FROM THE GROUP CONSISTING OF POLYGLYCOL AND POLYGLYCEROL RADICALS CONTAINING FROM 1 TO 3 ETHER LINKAGES, X IS AN ETHER-TYPE LINKAGE SELECGTED FROM THE GROUP CONSISTING OF OXYGEN AND SULFUR, AND R IS AN OIL-SOLUBLE, INERT, ESTER-FREE, ORGANIC PORTION CONTAINING AT LEAST 12 CARBON ATOMS.
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) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |