US4128482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mobility control of aqueous fluids in porous media
Assignee: Union Oil Company of California
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Filing: 1977-05-20
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Granted: 1978-12-05
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Expires: 1997-05-20
Abstract
Abstract A composition and method for providing improved mobility control in secondary and tertiary recovery processes obtained by injecting into a subterranean hydrocarbon-bearing formation, as part of the secondary or tertiary recovery fluid, an aqueous solution of a mixture of a heteropolysaccharide produced by bacteria of the genus Xanthomonas together with a polyacrylamide or a chemically altered derivative of a polyacrylamide.
Inventors
- 👤 Robert K. Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:20
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/90; C09K8/905; C09K8/58; C09K8/588; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A waterflooding composition exhibiting a high viscosity and resistance to shear degradation and which retains these properties upon admixture with water-soluble salts comprising an aqueous liquid containing from 0.005 to 5 weight percent of a polymer mixture comprising 25 to 75 weight percent of a heteropolysaccharide produced by genus Xanthomonas and 75 to 25 weight percent of a polyacrylamide or a partially hydrolyzed polyacrylamide having a molecular weight of from 0.5 × 10 6 to 40 × 10 6 .
Claim 2
Dependent Claim
80 words
A waterflooding composition exhibiting a high viscosity and resistance to shear degradation and which retains these properties upon admixture with water-soluble salts comprising an aqueous liquid containing from 0.005 to 5 weight percent of a polymer mixture comprising 25 to 75 weight percent of a heteropolysaccharide produced by genus Xanthomonas and 75 to 25 weight percent of a polyacrylamide or a partially hydrolyzed polyacrylamide having a molecular weight of from 0.5 × 10 6 to 40 × 10 6 .
Claim 3
Dependent Claim
16 words
The composition as defined in claim 1 wherein the aqueous liquid is fresh water or brine.
Claim 4
Dependent Claim
17 words
The composition as defined in claim 1 wherein the heteropolysaccharide is produced by the species Xanthomonas campestris.
Claim 5
Dependent Claim
12 words
The composition as defined in claim 3 wherein the heteropolysaccharide is B-1459.
Claim 6
Dependent Claim
28 words
The composition as defined in claim 1 wherein from about 12 to about 45 percent of the carboxamide groups of the polyacrylamide have been hydrolyzed to carboxyl groups.
References Cited (Backward Citations)
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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) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |