Patent US4247405A successfully refreshed from Google Patents.
US4247405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscosity-stabilized aqueous solutions
Assignee: Phillips Petroleum Co
•
Filing: 1978-06-30
•
Granted: 1981-01-27
•
Expires: 1998-06-30
Abstract
Abstract Thiourea functions as a solution viscosity stabilizer in aqueous compositions comprising thiourea, nonionic polymers such as polyalkylene oxides and anionic surfactants such as petroleum sulfonates. The aqueous compositions are useful in connection with fluid-drive oil recovery processes, processes for drilling, completing, or working over wells, or the like processes in which a thickened fluid is injected into or brought into contact with a subterranean earth formation.
Inventors
- 👤 Donald R. Wier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:21
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584; C09K8/588; C09K8/592; C09K8/594; C09K8/60; C09K8/62; C09K8/70; C09K8/703; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
An aqueous solution exhibiting a relatively stable solution viscosity at ambient temperature and after heating at 70° C. consisting essentially of, based on the total weight of the solution: (a) 0.001 to 2 weight percent of a nonionic polyalkylene oxide polymeric component which is a polyethylene oxide or a polypropylene oxide having an average molecular weight in the range of 100,000 to 10,000,000, (b) 0.5 to 10 weight percent of an ionic surfactant, (c) 0.1 to 9 weight percent thioruea, and (d) the balance water.
Claim 2
Dependent Claim
85 words
An aqueous solution exhibiting a relatively stable solution viscosity at ambient temperature and after heating at 70° C. consisting essentially of, based on the total weight of the solution: (a) 0.001 to 2 weight percent of a nonionic polyalkylene oxide polymeric component which is a polyethylene oxide or a polypropylene oxide having an average molecular weight in the range of 100,000 to 10,000,000, (b) 0.5 to 10 weight percent of an ionic surfactant, (c) 0.1 to 9 weight percent thioruea, and (d) the balance water.
Claim 3
Dependent Claim
28 words
A composition according to claim 1 wherein (a) is a polyalkylene oxide having a molecular weight of 3,000,000 to 5,000,000 and (b) is a petroleum sulfonate anionic surfactant.
Claim 4
Dependent Claim
44 words
A composition according to claim 1 wherein the amount of (a) is in the range of 0.1 to 1.5 weight percent, (b) is in the range of 2 to 8 weight percent, and (c) is in the range of 3 to 6 weight percent.
Claim 5
Dependent Claim
18 words
A composition according to claim 3 wherein (a) is a polyethylene oxide and (b) is a petroleum sulfonate.
Claim 6
Independent Claim
84 words
A method for improving the stability of the solution viscosity of an aqueous solution containing (a) from 0.001 to 2 weight percent of a nonionic polyalkylene oxide polymeric component which is a polyethylene oxide or a polypropylene oxide having an average molecular weight in the range of 100,000 to 10,000,000 and (b) from 0.5 to 10 weight percent of an ionic surfactant which comprises incorporating into said aqueous solution 0.1 to 9 weight percent of thioruea based on the total weight of aqueous solution.
Claim 7
Independent Claim
84 words
A method for improving the stability of the solution viscosity of an aqueous solution containing (a) from 0.001 to 2 weight percent of a nonionic polyalkylene oxide polymeric component which is a polyethylene oxide or a polypropylene oxide having an average molecular weight in the range of 100,000 to 10,000,000 and (b) from 0.5 to 10 weight percent of an ionic surfactant which comprises incorporating into said aqueous solution 0.1 to 9 weight percent of thioruea based on the total weight of aqueous solution.
Claim 8
Dependent Claim
20 words
A method according to claim 5 wherein (a) is a polyethylene oxide and (b) is a petroleum sulfonate anionic surfactant.
Claim 9
Dependent Claim
72 words
A process according to claim 5 wherein (a) is a polyethylene oxide having a molecular weight of 3,000,000 to 5,000,000 and is present in the range of 0.1 to 1.5 weight percent, (b) is a petroleum sulfonate and is present in an amount ranging from 2 to 8 weight percent and (c) is present in an amount ranging from 3 to 6 weight percent based on the total weight of the solution.
References Cited (Backward Citations)
US3116791A
Cited
US3201367A
Cited
US3370035A
Cited
US3235523A
Cited
US3373808A
Cited
US3412793A
Cited
US3663477A
Cited
US3739848A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |