Patent US3762476A successfully refreshed from Google Patents.
US3762476A
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Subterranean formation permeability correction
Assignee: Phillips Petroleum Co
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Filing: 1972-01-03
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Granted: 1973-10-02
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Expires: 1992-01-03
Abstract
Abstract A method for reducing the quantity of water recovered from a subterranean formation which is penetrated by at least one well bore wherein the formation permeability to water is corrected, yielding prolonged mobility control and/or plugging, achieved through injecting aqueous polymer solutions interspaced with ionic solutions of polymer-complexing cations and brine.
Inventors
- 👤 J Gall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:56
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/887
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
A method according to claim 1 wherein the first and second aqueous polymer solutions are comprised of from about 200 to about 10,000 ppm of a polymer selected from the group consisting of polyacrylamide, partially hydrolyzed polyacrylamide, polysaccharides, carboxymethylcellulose, polyvinyl alcohol, and polystyrene sulfonates; and the complexing ionic solution is comprised of from about 25 to about 10,000 ppm of the multivalent cations s selected from the group consisting of Fe2 , Fe3 , Al3 , Ti4 , Zn2 , Sn4 , Ca2 , Mg2 , and Cr3 , and from about 25 to about 10,000 ppm of retarding anions selected from the group consisting of acetate, nitrilotriacetate, tartrate, citrate, and phosphate.
Claim 2
Dependent Claim
22 words
A method according to claim 1 wherein the ionic solution has a pH in the range of from about 3 to 11.
Claim 3
Dependent Claim
16 words
A method according to claim 3 wherein the polymer is comprised of a partially hydroyzed polyacrylamide.
Claim 4
Dependent Claim
20 words
A method according to claim 1 wherein the first and second aqueous polymer solutions are comprised of the same polymer.
Claim 5
Dependent Claim
19 words
A method according to claim 1 wherein the first and second aqueous polymer solutions are comprised of different polymers.
Claim 6
Dependent Claim
13 words
A method according to claim 1 wherein steps (c) and (d) are repeated.
Claim 7
Dependent Claim
13 words
A method according to claim 1 wherein steps (b) and (c) are combined.
References Cited (Backward Citations)
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Cited
US3396790A
Cited
US3554287A
Cited
US3421584A
Cited
US3611733A
Cited
US3687200A
Cited
US3658129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |