US2775557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling muds containing acrylic acidacrylamide copolymer salts
Assignee: Wyeth Holdings LLC
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Filing: 1954-12-08
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Granted: 1956-12-25
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Expires: 1974-12-08
Abstract
No abstract record available.
Inventors
- 👤 Russell L Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:56
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN A PROCESS FOR DRILLING A WELL WHEREIN A MUD SEAL OF IMPROVED WATER-RETAINING PROPERTIES IS FOMED ON THE WALL OF SAID WELL BY CIRCULATING THEREIN AN AQUEOUS CLAY BASE DRILLING MUD CONTAINING, AS A WALL-SEALING AGENT, ABOUT 0.1 TO 5 LBS. PER BARREL OF A WATER-SOLUBLE SALT OF AN ACRYLIC ACID-ACRYLAMIDE POLYMER HAVING A MOLECULAR WEIGHT OF AT LEAST 10,000, THE METHOD OF AVOIDING THE FORMATION OF HIGH VISCOSITY IN SAID MUD WHICH COMPRISES ADDING SAID WALL-SEALING AGENT THERETO AS A POLYMER WHEREIN THE RATIO OF CARBOXYLIC ACID SALT GROUPS TO AMIDE GROUPS IS BETWEEN ABOUT 10:90 AND 45:55.
Claim 2
Dependent Claim
100 words
IN A PROCESS FOR DRILLING A WELL WHEREIN A MUD SEAL OF IMPROVED WATER-RETAINING PROPERTIES IS FOMED ON THE WALL OF SAID WELL BY CIRCULATING THEREIN AN AQUEOUS CLAY BASE DRILLING MUD CONTAINING, AS A WALL-SEALING AGENT, ABOUT 0.1 TO 5 LBS. PER BARREL OF A WATER-SOLUBLE SALT OF AN ACRYLIC ACID-ACRYLAMIDE POLYMER HAVING A MOLECULAR WEIGHT OF AT LEAST 10,000, THE METHOD OF AVOIDING THE FORMATION OF HIGH VISCOSITY IN SAID MUD WHICH COMPRISES ADDING SAID WALL-SEALING AGENT THERETO AS A POLYMER WHEREIN THE RATIO OF CARBOXYLIC ACID SALT GROUPS TO AMIDE GROUPS IS BETWEEN ABOUT 10:90 AND 45:55.
References Cited (Backward Citations)
US2552775A
Cited
US2718497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |