Patent US4439333A successfully refreshed from Google Patents.
US4439333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy brine viscosifiers
Assignee: Baroid Technology Inc
•
Filing: 1981-05-08
•
Granted: 1984-03-27
•
Expires: 2001-05-08
Abstract
Abstract Polymeric compositions for, and methods of, increasing the viscosity of aqueous brine well servicing fluids comprising adding to the brine a composition containing hydroxyethyl cellulose, a solid organic activating agent for the hydroxyethyl cellulose, and a solvent for the activating agent which also functions as a suspending medium or carrier for the hydroxyethyl cellulose.
Inventors
- 👤 Roy F. House
- 👤 Lonnie D. Hoover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:43
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; Y10S507/926; Y10S507/935
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
A polymeric composition useful for viscosifying aqueous brines at ambient temperature which comprises: (a) from about 10% to about 30% by weight hydroxyethyl cellulose; (b) from about 10% to about 40% by weight of a solid organic activating agent selected from the group consisting of phenol and substituted phenols wherein from 1 to 5 substituent groups are present in the molecule, the substituent groups being selected from the group consisting of OH, NH 2 , NO 2 , Cl, Br, and mixtures thereof; and (c) an organic solvent for said activating agent which has no appreciable swelling effect on the hydroxyethyl cellulose.
Claim 2
Dependent Claim
102 words
A polymeric composition useful for viscosifying aqueous brines at ambient temperature which comprises: (a) from about 10% to about 30% by weight hydroxyethyl cellulose; (b) from about 10% to about 40% by weight of a solid organic activating agent selected from the group consisting of phenol and substituted phenols wherein from 1 to 5 substituent groups are present in the molecule, the substituent groups being selected from the group consisting of OH, NH 2 , NO 2 , Cl, Br, and mixtures thereof; and (c) an organic solvent for said activating agent which has no appreciable swelling effect on the hydroxyethyl cellulose.
Claim 3
Dependent Claim
56 words
The composition of claim 1 wherein said organic solvent is water soluble and wherein said organic solvent, when uniformly mixed with said hydroxyethyl cellulose in a weight ratio of hydroxyethyl cellulose to organic solvent of 1:2, produces a mixture with free solvent present after remaining quiescent for one week at ambient temperature in a sealed container.
Claim 4
Dependent Claim
52 words
The composition of claim 1 wherein the concentration of said hydroxyethyl cellulose is from about 15% to about 25%, the concentration of said activating agent is from about 15% to about 30%, and wherein the concentration of said organic solvent is from about 50% to about 70% by weight of said composition.
Claim 5
Dependent Claim
56 words
A clear brine well servicing fluid having a density in the range from about 13.0 ppg. to about 19.2 ppg. containing a soluble salt selected from the group consisting of calcium chloride, calcium bromide, zinc bromide and mixtures thereof, and a viscosity increasing amount of a polymeric composition of any of claims 1, 2 or 3.
Claim 6
Dependent Claim
30 words
A method of increasing the viscosity of an aqueous brine which comprises adding to the brine a viscosifying amount of polymeric composition of any of claim 1, 2 or 3.
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) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |