US3768566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for fracturing high temperature well formations
Assignee: Halliburton Co
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Filing: 1972-04-18
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Granted: 1973-10-30
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Expires: 1992-04-18
Abstract
Abstract This invention provides a fracturing fluid having a high viscosity at temperatures above 200*F comprising an aqueous fluid having a pH of less than 7, a water soluble alcohol and a corsslinked polysaccharide.
Inventors
- 👤 J Ely
- 👤 M Holtmyer
- 👤 J Tinsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:53
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/66; C09K8/68; C09K8/685
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
36 words
The method of claim 1 wherein said fluid is further comprised of an alcohol having the general formula: CnH(2n 1)OH, wherein n is an integer within the range of 1 to about 5 and mixtures thereof.
Claim 2
Dependent Claim
38 words
The method of claim 2 wherein said fluid is further comprised of a base coated with a material which is insoluble in said fluid and has a melting point within the range of about 150*F to about 300*F.
Claim 3
Dependent Claim
48 words
The method of claim 3 wherein said fluid is further comprised of a gelling agent selected from the group consisting of a hydratable polysaccharide having a molecular weight of at least about 100,000; a hydratable polyacrylamide having a molecular weight of at least about 30,000 and mixtures thereof.
Claim 4
Dependent Claim
32 words
The method of claim 4 wherein said gelling agent is hydroxyethylcellulose having an ethylene oxide substiTution within the range of about 1.3 to about 3 moles of ethylene oxide per anhydroglucose unit.
Claim 5
Dependent Claim
25 words
The method of claim 3 wherein said base is coated with wax having a melting point within the range of about 150*F to about 300*F.
Claim 6
Dependent Claim
27 words
The method of claim 2 wherein said alcohol has the general formula: CnH(2n 1)OH, wherein n is an integer within the range of 1 to about 4.
Claim 7
Dependent Claim
27 words
The method of claim 2 wherein said alcohol has the general formula: CnH(2n 1)OH, wherein n is an integer within the range of 1 to about 3.
Claim 8
Dependent Claim
36 words
The method of claim 1 wherein said polysaccharide is selected from the group consisting of galactomannan gums, glucomannan gums, cellulose derivatives and mixtures thereof, said polysaccharide having a molecular weight of at least about 100, 000.
Claim 9
Dependent Claim
32 words
The method of claim 9 wherein said cellulose derivative is hydroxyethylcellulose having an ethylene oxide substitution within the range of about 1 to about 10 moles of ethylene oxide per anhydroglucose unit.
Claim 10
Dependent Claim
27 words
The method of claim 10 wherein said ethylene oxide substitution is within the range of about 1.3 to about 3 moles of ethylene oxide per anhydroglucose unit.
Claim 11
Dependent Claim
40 words
The method of claim 1 wherein said polysaccharide is crosslinked with a dialdehyde selected from the group consisting of dialdehydes having the general formula: OHC (CH2)n CHO, wherein n is an integer within the range of 0 to about 3.
Claim 12
Dependent Claim
12 words
The method of claim 1 wherein said polysaccharide is crosslinked with glyoxal.
Claim 13
Dependent Claim
12 words
The method of claim 1 wherein said polysaccharide is crosslinked with glutardialdehyde.
Claim 14
Dependent Claim
18 words
The method of claim 1 wherein said pH is within the range of about 3 to about 4.
Claim 15
Dependent Claim
39 words
The method of claim 1 wherein said polysaccharide is crosslinked with said compound at a concentration within the range of about 0.05 to about 100 parts by weight of said compound per 100 parts by weight of said polysaccharide.
Claim 16
Independent Claim
177 words
A method of fracturing a subterranean formation comprising: contacting said formation with an aqueous fluid comprising hydroxyethylcellulose having an ethylene oxide substitution within the range of about 1.3 to about 3 moles of ethylene oxide per anhydroglucose unit and being crosslinked with glyoxal at a concentration within the range of about 0.1 to about 2 parts by weight glyoxal per 100 parts by weight of said hydroxyethylcellulose, within the range of 2 to about 7 parts by volume per 100 parts by volume of said aqueous fluid of an alcohol having the general formula: CnH(2n 1)OH wherein n is an integer within the range of 1 to about 3, and within the range of about 5 to about 50 pounds per 1000 gallons of said aqueous fluid of a base coated with wax having a melting point within the range of about 150*F to about 300*F, wherein said fluid has a pH of less than 7; applying sufficient pressure to said fluid to fracture said formation; and maintaining said pressure while forcing said fluid into said fracture.
Claim 17
Dependent Claim
50 words
The method of claim 17 wherein said fluid further comprises within the range of about 10 to about 300 pounds per 1,000 gallons of said aqueous fluid of hydroxyethylcellulose having an ethylene oxide substitution within the range of about 1.3 to about 3 moles of ethylene oxide per anhydroglucose unit.
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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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |