US3658129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In situ gelation of polymers during waterflooding
Assignee: Phillips Petroleum Co
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Filing: 1970-09-01
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Granted: 1972-04-25
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Expires: 1990-09-01
Abstract
Abstract A method for plugging waterflood zones through the in situ production of gelatinous materials derived from injecting a solution containing a water-soluble bivalent metal salt and a water-soluble polymer of high molecular weight having groups chemically reactive with trivalent metal ions into a waterflood zone followed by the injection of air which converts bivalent metal ions to trivalent metal ions thereby resulting in the aforementioned gelatinous plugging material.
Inventors
- 👤 William C Lanning
- 👤 James W Gall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:45
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/504; C09K8/506; C09K8/508; C09K8/512
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
31 words
The method according to claim 1 wherein the polymer has a molecular weight of at least 100,000 and is selected from at least one of carboxylated cellulose and partly hydrolyzed polyacrylamide.
Claim 2
Dependent Claim
31 words
A method according to claim 1 wherein the bivalent metal salt is selected from at least one of ferrous sulfate, ferrous chloride, ferrous nitrate, chromous chloride, chromous nitrate, and chromous acetate.
Claim 3
Dependent Claim
32 words
A method according to claim 1 wherein the bivalent metal salt is a ferrous salt and the ratio of ferrous salt to polymer by weight is from about 1.0 to about 0.006.
Claim 4
Dependent Claim
33 words
A method according to claim 1 wherein the oxygen content of the solution containing the water-soluble bivalent metal salt and the water-soluble polymer is from about 0.1 to about 4.0 parts per million.
Claim 5
Dependent Claim
26 words
A method according to claim 1 wherein the water-sOluble bivalent metal salt and water-soluble polymer solution is introduced to the waterflood zone in a continuous method.
Claim 6
Dependent Claim
26 words
A method according to claim 1 wherein the water-soluble bivalent metal salt and water-soluble polymer solution is introduced to the waterflood zone through a slug method.
References Cited (Backward Citations)
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US3370649A
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US3400761A
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US3396790A
Cited
US3502149A
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US3406754A
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US3580337A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |