US3962101A
Expired / Lapsed
US
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Composition and method for acidizing earthen formations
Assignee: Schlumberger Technology Corp
•
Filing: 1973-12-17
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Granted: 1976-06-08
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Expires: 1993-12-17
Abstract
Abstract A formation is acidized with a composition comprising a formation acidizing acid and a cationic surfactant which renders oil-containing earthen formations oil-wet, said surfactant being present in said composition in an amount which is sufficient to increase the reaction time of the acid acting on the formation.
Inventors
- 👤 Curtis W. Crowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:16
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; C09K8/74; Y; Y10; Y10S; Y10S507/00; Y10S507/933
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
62 words
A composition for acidizing a subterranean formation which comprises: an aqueous acidizing acid solution for said formation and an effective amount of a cationic surfactant in said solution to reduce the normal reaction rate of said acidizing solution with said formation, said cationic surfactant consisting of an alkyl C 8 to C 18 primary amine characterized as rendering the formation surface oil-wet.
Claim 2
Dependent Claim
62 words
A composition for acidizing a subterranean formation which comprises: an aqueous acidizing acid solution for said formation and an effective amount of a cationic surfactant in said solution to reduce the normal reaction rate of said acidizing solution with said formation, said cationic surfactant consisting of an alkyl C 8 to C 18 primary amine characterized as rendering the formation surface oil-wet.
Claim 3
Dependent Claim
23 words
The composition of claim 1 including in addition a surface active agent which aids in dispersing said cationic surfactant in said acid solution.
Claim 4
Dependent Claim
17 words
The composition of claim 1 including in addition a minor quantity of oil dispersed in said composition.
Claim 5
Dependent Claim
10 words
The composition of claim 1 wherein said acid is HCl.
Claim 6
Dependent Claim
11 words
The composition of claim 1 wherein said cationic surfactant comprises cocoamine.
Claim 7
Dependent Claim
18 words
The composition of claim 1 wherein said acidizing solution contains greater than 15 per cent of said acid.
Claim 8
Dependent Claim
10 words
The composition of claim 6 wherein said acid is HCl.
Claim 9
Independent Claim
76 words
A method of acidizing an oil containing subterranean formation with an acidizing acid solution which comprises: contacting the subterranean formation with an acidizing acid solution containing dispersed therein an effective amount of a cationic surfactant consisting of an alkyl C 8 to C 18 primary amine to increase the normal reaction time of said acidizing acid solution with said formation, said cationic surfactant characterized as in the presence of said acid, rendering oil containing formations oil-wet.
Claim 10
Independent Claim
76 words
A method of acidizing an oil containing subterranean formation with an acidizing acid solution which comprises: contacting the subterranean formation with an acidizing acid solution containing dispersed therein an effective amount of a cationic surfactant consisting of an alkyl C 8 to C 18 primary amine to increase the normal reaction time of said acidizing acid solution with said formation, said cationic surfactant characterized as in the presence of said acid, rendering oil containing formations oil-wet.
Claim 11
Dependent Claim
28 words
The method of claim 8 wherein said acidizing acid solution contains in addition a surface active agent which aids in dispersing said cationic surfactant in said acidizing solution.
Claim 12
Dependent Claim
11 words
The method of claim 8 wherein said acidizing acid is HCl.
Claim 13
Dependent Claim
22 words
The method of claim 8 wherein said acidizing acid solution contains in addition a minor quantity of oil dispersed in said solution.
Claim 14
Dependent Claim
10 words
The method of claim 8 wherein the formation contains limestone.
Claim 15
Dependent Claim
11 words
The method of claim 8 wherein said cationic surfactant comprises cocoamine.
Claim 16
Dependent Claim
20 words
The method of claim 8 wherein said acidizing solution contains greater than 15 per cent by weight of said acid.
Claim 17
Dependent Claim
10 words
The method of claim 14 wherein said acid is HCl.
Claim 18
Dependent Claim
13 words
The method of claim 8 wherein the subterranean formation comprises a calcareous material.
Claim 19
Dependent Claim
11 words
The composition of claim 1 wherein said amine is dodecyl amine.
Claim 20
Dependent Claim
11 words
The composition of claim 4 wherein said amine is dodecyl amine.
Claim 21
Dependent Claim
11 words
The method of claim 8 wherein said amine is dodecyl amine.
Claim 22
Dependent Claim
11 words
The method of claim 14 wherein said amine is dodecyl amine.
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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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |