US3782467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reducing gas production
Assignee: Phillips Petroleum Co
•
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
2026-10-28 23:47
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)
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US3421584A
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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 |