Patent US4012327A successfully refreshed from Google Patents.
US4012327A
Expired / Lapsed
US
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Thickened alcohol well treating compositions
Assignee: ECC SPECIALTY CHEMICALS Inc
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Filing: 1975-02-12
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Granted: 1977-03-15
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Expires: 1995-02-12
Abstract
Abstract Alcohols, particularly anhydrous alcohols, thickened with aminomethylated polyacrylamide, used as fracturing fluids for stimulating well production.
Inventors
- 👤 Jerry Emile Boothe
- 👤 Fred David Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:38
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/64; Y; Y10; Y10S; Y10S507/00; Y10S507/922
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
148 words
A method of fracturing a subterranean formation comprising: a. contacting said formation with a substantially anhydrous alcohol base fracturing fluid comprising one or more substantially anhydrous alcohols of the formula: C.sub.n H.sub.(2n .sub.+ 1) OH where n is an integer of 1 to 5; said substantially anhydrous alcohols containing from 0 to about 5 percent by weight of water; and as a thickening agent therefor, at least 0.5 percent by weight of the alcohol of a composition containing repeating units of the formula: ##STR2##where R 1 is hydrogen or methyl, and R 2 and R 3 are each independently selected from alkyl radicals of one to five carbon atoms; and wherein the molecular weight of said composition is at least about 5,000; b. applying sufficient pressure to the said fracturing fluid to fracture said formation; and c. maintaining said pressure while forcing said fracturing fluid into said fracture.
Claim 2
Independent Claim
148 words
A method of fracturing a subterranean formation comprising: a. contacting said formation with a substantially anhydrous alcohol base fracturing fluid comprising one or more substantially anhydrous alcohols of the formula: C.sub.n H.sub.(2n .sub.+ 1) OH where n is an integer of 1 to 5; said substantially anhydrous alcohols containing from 0 to about 5 percent by weight of water; and as a thickening agent therefor, at least 0.5 percent by weight of the alcohol of a composition containing repeating units of the formula: ##STR2##where R 1 is hydrogen or methyl, and R 2 and R 3 are each independently selected from alkyl radicals of one to five carbon atoms; and wherein the molecular weight of said composition is at least about 5,000; b. applying sufficient pressure to the said fracturing fluid to fracture said formation; and c. maintaining said pressure while forcing said fracturing fluid into said fracture.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the thickening agent is dimethylaminomethyl polyacrylamide.
Claim 4
Dependent Claim
10 words
The method of claim 1 wherein the alcohol is methanol.
Claim 5
Dependent Claim
10 words
The method of claim 3 wherein the alcohol is isopropanol.
Claim 6
Dependent Claim
115 words
A substantially anhydrous alcohol base fracturing fluid composition for use in fracturing subterranean formations comprising: a. one or more substantially anhydrous alcohols of the formula: C.sub.n H.sub.(2n .sub.+ 1) OH where n is an integer of 1 to 5; said substantially anhydrous alcohols containing from 0 to about 5 percent by weight of water; and b. at least 0.5 percent by weight of the alcohol of a thickening agent composition containing repeating units of the formula: ##STR3##where R 1 is hydrogen or methyl, and R 2 and R 3 are each independently selected from alkyl radicals of one to five carbon atoms; and wherein the molecular weight of said composition is at least about 5,000.
Claim 7
Dependent Claim
115 words
A substantially anhydrous alcohol base fracturing fluid composition for use in fracturing subterranean formations comprising: a. one or more substantially anhydrous alcohols of the formula: C.sub.n H.sub.(2n .sub.+ 1) OH where n is an integer of 1 to 5; said substantially anhydrous alcohols containing from 0 to about 5 percent by weight of water; and b. at least 0.5 percent by weight of the alcohol of a thickening agent composition containing repeating units of the formula: ##STR3##where R 1 is hydrogen or methyl, and R 2 and R 3 are each independently selected from alkyl radicals of one to five carbon atoms; and wherein the molecular weight of said composition is at least about 5,000.
Claim 8
Dependent Claim
10 words
The composition of claim 5 wherein the alcohol is methanol.
Claim 9
Dependent Claim
10 words
The composition of claim 5 wherein the alcohol is isopropanol.
Claim 10
Independent Claim
121 words
A method of thickening one or more substantially anhydrous alcohols for use in fracturing the subterranean formations, said alcohols being of the formula: C.sub.n H.sub.(2n .sub.+ 1) OH where n is an integer of 1 to 5, said substantially anhydrous alcohols containing from 0 to about 5 percent by weight of water; comprising adding thereto at least 0.5 percent by weight of the alcohol of a thickening agent composition containing repeating units of the formula: ##STR4##where R 1 is hydrogen or methyl, and R 2 and R 3 are each independently selected from alkyl radicals of one to five carbon atoms; and wherein the molecular weight of said composition is at least about 5,000; whereby said substantially anhydrous alcohols are thickened.
Claim 11
Independent Claim
121 words
A method of thickening one or more substantially anhydrous alcohols for use in fracturing the subterranean formations, said alcohols being of the formula: C.sub.n H.sub.(2n .sub.+ 1) OH where n is an integer of 1 to 5, said substantially anhydrous alcohols containing from 0 to about 5 percent by weight of water; comprising adding thereto at least 0.5 percent by weight of the alcohol of a thickening agent composition containing repeating units of the formula: ##STR4##where R 1 is hydrogen or methyl, and R 2 and R 3 are each independently selected from alkyl radicals of one to five carbon atoms; and wherein the molecular weight of said composition is at least about 5,000; whereby said substantially anhydrous alcohols are thickened.
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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) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |