US4392964A
Expired / Lapsed
US
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Compositions and method for thickening aqueous brines
Assignee: Baroid Technology Inc
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Filing: 1980-05-05
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Granted: 1983-07-12
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Expires: 2000-05-05
Abstract
Abstract A polymeric composition useful in the thickening of aqueous brines comprising hydroxyethyl cellulose, a water miscible organic liquid and an aqueous liquid.
Inventors
- 👤 Roy F. House
- 👤 Lonnie D. Hoover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:25
CPC Classifications
C; C08; C08L; C08L1/00; C08L1/08; C08L1/26; C08L1/28; C08L1/284; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/06; C09K8/08; C09K8/10; Y; Y10; Y10S; Y10S507/00; Y10S507/922; Y10S507/925; Y10S507/927; Y10S507/928; Y10S507/935
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
A well servicing fluid comprising: an aqueous brine having a density of at least 11.7 ppg; and a polymeric composition comprising from about 5 to about 30% by weight of hydroxyethyl cellulose, at least about 40% by weight of isopropanol, and from about 3 to about 40% by weight of an aqueous liquid, wherein said isopropanol, when uniformly mixed with said hydroxyethyl cellulose in a weight ratio of hydroxyethyl cellulose to organic liquid of 1:2, produces a mixture with free liquid present after remaining quiescent for one week at ambient temperature in a sealed container.
Claim 2
Dependent Claim
95 words
A well servicing fluid comprising: an aqueous brine having a density of at least 11.7 ppg; and a polymeric composition comprising from about 5 to about 30% by weight of hydroxyethyl cellulose, at least about 40% by weight of isopropanol, and from about 3 to about 40% by weight of an aqueous liquid, wherein said isopropanol, when uniformly mixed with said hydroxyethyl cellulose in a weight ratio of hydroxyethyl cellulose to organic liquid of 1:2, produces a mixture with free liquid present after remaining quiescent for one week at ambient temperature in a sealed container.
Claim 3
Dependent Claim
23 words
The fluid of claim 1 wherein said aqueous brine comprises a solution of at least one water soluble salt of a multivalent metal.
Claim 4
Dependent Claim
28 words
The fluid of claim 2 wherein said water soluble salt is selected from the group consisting of calcium chloride, calcium bromide, zinc chloride, zinc bromide, and mixtures thereof.
Claim 5
Dependent Claim
21 words
The fluid of claim 1 wherein the density of said aqueous brine is from about 12.0 ppg to about 19.2 ppg.
Claim 6
Dependent Claim
14 words
The composition of claim 1 wherein said aqueous liquid has a pH above 7.
Claim 7
Dependent Claim
14 words
The composition of claim 1 wherein said aqueous liquid has a pH below 7.
Claim 8
Dependent Claim
27 words
The composition of claim 1 wherein said aqueous liquid is present in said polymeric composition in an amount of from about 3 to about 30% by weight.
Claim 9
Independent Claim
108 words
A method of preparing a well servicing fluid comprising: forming a generally uniform polymeric composition by admixing from about 5 to about 30% by weight of hydroxyethyl cellulose, at least about 40% by weight of isopropanol, and from about 3 to about 40% by weight of an aqueous liquid, wherein said isopropanol, when uniformly mixed with said hydroxyethyl cellulose in a weight ratio of hydroxyethyl cellulose to organic liquid of 1:2, produces a mixture with free liquid present after remaining quiescent for one week at ambient temperature in a sealed container; and admixing said polymeric composition with an aqueous brine having a density of at least 11.7 ppg.
Claim 10
Independent Claim
108 words
A method of preparing a well servicing fluid comprising: forming a generally uniform polymeric composition by admixing from about 5 to about 30% by weight of hydroxyethyl cellulose, at least about 40% by weight of isopropanol, and from about 3 to about 40% by weight of an aqueous liquid, wherein said isopropanol, when uniformly mixed with said hydroxyethyl cellulose in a weight ratio of hydroxyethyl cellulose to organic liquid of 1:2, produces a mixture with free liquid present after remaining quiescent for one week at ambient temperature in a sealed container; and admixing said polymeric composition with an aqueous brine having a density of at least 11.7 ppg.
Claim 11
Dependent Claim
18 words
The method of claim 8 wherein said polymeric composition is aged prior to admixing with said aqueous brine.
Claim 12
Dependent Claim
23 words
The method of claim 8 wherein said aqueous brine comprises a solution of at least one water soluble salt of a multivalent metal.
Claim 13
Dependent Claim
28 words
The method of claim 10 wherein said water soluble salt is selected from the group consisting of calcium chloride, calcium bromide, zinc chloride, zinc bromide, and mixtures thereof.
Claim 14
Dependent Claim
21 words
The method of claim 8 wherein the density of said aqueous brine is from about 12.0 ppg to about 19.2 ppg.
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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) | 1986-07-11 | 1987-01-10 | 1987-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-11 | 1991-01-10 | 1991-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-11 | 1995-01-10 | 1995-07-12 | $7700.00 | Window Closed / Lapsed |