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US4336146A
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Method of thickening heavy brine solutions
Assignee: Aqualon Co
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Filing: 1980-08-25
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Granted: 1982-06-22
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Expires: 2000-08-25
Abstract
Abstract Thickening of heavy brine solutions based on calcium halides by use of water-insoluble hydroxyethyl cellulose is disclosed.
Inventors
- 👤 Thomas G. Majewicz
- 👤 Thomas J. Podlas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:53
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; C09K8/02; C09K8/04; C09K8/06; C09K8/08; C09K8/10; Y; Y10; Y10S; Y10S507/00; Y10S507/925
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A method of thickening heavy calcium halide salt brine solutions having a density between about 11.5 and about 19 pounds per barrel which comprises dissolving therein, per barrel of brine, about 0.5 to 2 lbs. of a cellulose derivative selected from the class consisting of hydroxyethyl cellulose having a hydroxyethyl M.S. of about 0.2 to 1.2 and methyl cellulose having methyl D.S. of about 0.2 to 0.8, said cellulose derivative being soluble in tap or distilled water to the extent of less than 1% by weight.
Claim 2
Independent Claim
86 words
A method of thickening heavy calcium halide salt brine solutions having a density between about 11.5 and about 19 pounds per barrel which comprises dissolving therein, per barrel of brine, about 0.5 to 2 lbs. of a cellulose derivative selected from the class consisting of hydroxyethyl cellulose having a hydroxyethyl M.S. of about 0.2 to 1.2 and methyl cellulose having methyl D.S. of about 0.2 to 0.8, said cellulose derivative being soluble in tap or distilled water to the extent of less than 1% by weight.
Claim 3
Dependent Claim
21 words
A method according to claim 1 wherein the cellulose derivative is hydroxyethyl cellulose having hydroxyethyl M.S. of about 0.4 to 1.1.
Claim 4
Dependent Claim
13 words
A method according to claim 1 wherein the cellulose derivative is methyl cellulose.
Claim 5
Dependent Claim
84 words
A thickened solution comprising a calcium halide-salt brine having a density between about 11.5 and about 19 pounds per barrel and having dissolved therein, per barrel of said brine, about 0.5 to 2 pounds of a cellulose derivative selected from the class consisting of hydroxyethyl cellulose having hydroxyethyl M.S. of about 0.2 to 1.2 and methyl cellulose having methyl D.S. of about 0.2 to 0.8, said cellulose derivative being soluble in tap or distilled water to the extent of less than 1% by weight.
Claim 6
Dependent Claim
84 words
A thickened solution comprising a calcium halide-salt brine having a density between about 11.5 and about 19 pounds per barrel and having dissolved therein, per barrel of said brine, about 0.5 to 2 pounds of a cellulose derivative selected from the class consisting of hydroxyethyl cellulose having hydroxyethyl M.S. of about 0.2 to 1.2 and methyl cellulose having methyl D.S. of about 0.2 to 0.8, said cellulose derivative being soluble in tap or distilled water to the extent of less than 1% by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |