US3962102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and method for acidizing earthen formations
Assignee: Schlumberger Technology Corp
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Filing: 1973-12-17
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Granted: 1976-06-08
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Expires: 1993-12-17
Abstract
Abstract A subterranean formation (e.g. gas, oil or water bearing formation) is acidized with an emulsion comprising an aqueous acidizing solution, an oil and a cationic surfactant which renders oil-containing earthen formations oil-wet, said surfactant being present in said emulsion 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
2026-11-05 00:45
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: 13
Claim 1
Independent Claim
77 words
A method of acidizing an acid-soluble formation with an acidic solution in which said formation is soluble wherein the normal reaction time of said acid is extended, comprising: contacting said formation with a mixture of an aqueous acidizing solution-in-oil emulsion and an effective amount of a cationic surfactant to increase the normal reaction time of said aqueous acidizing solution-in-oil emulsion with said formation, said cationic surfactant consisting of an alkyl C 8 to C 18 primary amine.
Claim 2
Independent Claim
77 words
A method of acidizing an acid-soluble formation with an acidic solution in which said formation is soluble wherein the normal reaction time of said acid is extended, comprising: contacting said formation with a mixture of an aqueous acidizing solution-in-oil emulsion and an effective amount of a cationic surfactant to increase the normal reaction time of said aqueous acidizing solution-in-oil emulsion with said formation, said cationic surfactant consisting of an alkyl C 8 to C 18 primary amine.
Claim 3
Dependent Claim
25 words
The method as defined in claim 1 wherein said aqueous acidizing solution contains at least about 15 per cent by weight of an acidizing acid.
Claim 4
Dependent Claim
11 words
The method of claim 3 wherein said acidizing acid is HCl.
Claim 5
Dependent Claim
10 words
The method of claim 4 wherein the surfactant is dodecylamine.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein the cationic surfactant is dodecylamine.
Claim 7
Dependent Claim
64 words
A composition for acidizing a subterranean formation which comprises: a mixture of an aqueous acidizing solution-in-oil emulsion and an effective amount of a cationic surfactant to reduce the normal reaction rate of said aqueous acidizing solution-in-oil emulsion with said formation said cationic surfactant consisting of an alkyl C 8 to C 18 primary amine and characterized as rendering the surface of the formation oil-wet.
Claim 8
Dependent Claim
64 words
A composition for acidizing a subterranean formation which comprises: a mixture of an aqueous acidizing solution-in-oil emulsion and an effective amount of a cationic surfactant to reduce the normal reaction rate of said aqueous acidizing solution-in-oil emulsion with said formation said cationic surfactant consisting of an alkyl C 8 to C 18 primary amine and characterized as rendering the surface of the formation oil-wet.
Claim 9
Dependent Claim
22 words
The composition of claim 6 wherein the acidizing solution contains at least about 15 per cent by weight of an acidizing acid.
Claim 10
Dependent Claim
11 words
The composition of claim 7 wherein the cationic surfactant is dodecylamine.
Claim 11
Dependent Claim
20 words
The composition of claim 10 wherein the acidizing solution contains at least about 15 per cent by weight of HCl.
Claim 12
Dependent Claim
13 words
The method of claim 1 wherein the formation contains acid soluble calcareous materials.
Claim 13
Dependent Claim
14 words
The composition of claim 7 wherein the subterranean formation contains acid soluble calcareous materials.
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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 |