US3826311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Producing well treatment
Assignee: Calgon Corp
•
Filing: 1973-06-13
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Granted: 1974-07-30
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Expires: 1993-06-13
Abstract
Abstract Use of copolymers of (3-acrylamido-3-methyl) butyl trimethyl ammonium chloride and acrylamide to treat producing wells in order to reduce water production and improve the oil-water ratio of said well or gas-water.
Inventors
- 👤 N Sherwood
- 👤 M Szabo
- 👤 A Sharpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:01
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/882; E; E21; E21B; E21B33/00; E21B33/10; E21B33/13
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
11 words
A method as in claim 1 wherein said member is oil.
Claim 2
Dependent Claim
11 words
A method as in claim 1 wherein said member is gas.
Claim 3
Dependent Claim
31 words
A method as in claim 1 wherein said copolymer contains from about 1 to 60 mole percent (3-acrylamido-3-methyl) butyl trimethyl ammonium chloride and from about 40 to 99 mole percent acrylamide.
Claim 4
Dependent Claim
31 words
A method as in claim 4 wherein the copolymer contains from about 15 to 35 mole percent (3-acrylamido-3-methyl) butyl trimethyl ammonium chloride and from about 65 to 85 mole percent acrylamide.
Claim 5
Dependent Claim
22 words
A method as in claim 1 wherein from about 0 to 50 percent of the amide groups are hydrolyzed to carboxyl groups.
Claim 6
Dependent Claim
17 words
A method as in claim 1 wherein the copolymer has a molecular weight of at least 100,000.
References Cited (Backward Citations)
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Cited
US2776714A
Cited
US3247900A
Cited
US3087543A
Cited
US3308885A
Cited
US3448800A
Cited
US3679000A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |