Patent US3782467A successfully refreshed from Google Patents.
US3782467A
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Method for reducing gas production
Assignee: Phillips Petroleum Co
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Filing: 1972-07-26
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Granted: 1974-01-01
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Expires: 1992-07-26
Abstract
Abstract A method for reducing gas permeability in a hydrocarbon bearing subterranean formation having zones of gas permeability and at least two penetrating well bores, comprising the injection into said zones of a basic pH aqueous-thickener slug containing an acidic responsive crosslinking system and acidifying the aqueousthickener slug with carbon dioxide for plugging in situ the zones of gas permeability.
Inventors
- 👤 J Hessert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:57
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/887; C09K8/42; C09K8/50; C09K8/504; C09K8/506; C09K8/508; C09K8/512; C09K8/90; C09K8/905; E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/243
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
41 words
A method according to claim 1 wherein the thickener is selected from the group consisting of polysaccharides, alkyl and hydroalkyl cellulose derivatives, and partially hydrolyzed polyacrylamides; and the aqueous media is formation brine having up to 170,000 ppm of dissolved solids.
Claim 2
Dependent Claim
51 words
A method according to claim 1 wherein the reducible crosslinking agent is a reducible polyvalent metal compound selected from the group consisting of potassium permanganate, sodium permanganate, aluminum chromate, aluminum dichromate, alkali metal chromates, alkali metal dichromates, and chromium trioxide; and a reducing agent which is activated by an acid media.
Claim 3
Dependent Claim
35 words
A method according to claim 2 wherein the thickener concentration varies form 0.2 to 2 percent by weight of the aqueous slug and said slug has a basic pH of up to 10 until injected.
Claim 4
Dependent Claim
20 words
A method according to claim 1 where carbon dioxide is injected into the formation and into contact with said thickener.
Claim 5
Dependent Claim
28 words
A method according to claim 1 including: establishing an in situ fireflood within the formation; and passing resultant carbon dioxide from the fireflood into contact with said thickener.
Claim 6
Dependent Claim
18 words
A method according to claim 1 wherein the carbon dioxide is naturally occurring carbon dioxide in the formation.
References Cited (Backward Citations)
US3208524A
Cited
US3195630A
Cited
US3251414A
Cited
US3285338A
Cited
US3378070A
Cited
US3421584A
Cited
US3502149A
Cited
US3583167A
Cited
US3614985A
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US3658129A
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US3727687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |