Patent US4996691A successfully refreshed from Google Patents.
US4140640A
Expired / Lapsed
US
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Self-breaking retarded acid emulsion
Assignee: Schlumberger Technology Corp
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Filing: 1977-07-06
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Granted: 1979-02-20
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Expires: 1997-07-06
Abstract
Abstract A subterranean formation is acidized with an emulsion comprising an aqueous acidizing solution, an oil, an effective amount each of an alkyl C8 to C18 primary fatty amine and at least one diethanolamide of at least one C8 to C18 fatty acid.
Inventors
- 👤 Gary A. Scherubel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:43
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; Y; Y10; Y10S; Y10S507/00; Y10S507/933; Y10S507/934
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
87 words
In a method of acidizing an acid-soluble subterranean formation by contacting said formation with a retarded aqueous acid solution-in-oil emulsion, said emulsion including an effective retarding amount of at least one alkyl C 8 to C 18 primary amine, the improvement which comprises: including in said emulsion, an effective amount of at least one diethanolamide of at least one C 8 to C 18 fatty acid so that said emulsion breaks upon the substantial depletion of the acidizing capacity of the emulsion after contact with the formation.
Claim 2
Dependent Claim
87 words
In a method of acidizing an acid-soluble subterranean formation by contacting said formation with a retarded aqueous acid solution-in-oil emulsion, said emulsion including an effective retarding amount of at least one alkyl C 8 to C 18 primary amine, the improvement which comprises: including in said emulsion, an effective amount of at least one diethanolamide of at least one C 8 to C 18 fatty acid so that said emulsion breaks upon the substantial depletion of the acidizing capacity of the emulsion after contact with the formation.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the amine is dodecylamine or cocoamine and the amide is the diethanolamide of oleic acid.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the acid solution is aqueous HCl.
Claim 5
Dependent Claim
30 words
The method of claim 3 wherein the concentration of the HCl in the acid solution is greater than 25 percent by weight of the acid solution phase of the emulsion.
Claim 6
Dependent Claim
21 words
The method of claim 4 wherein the amine is dodecylamine or cocoamine and the amide is the diethanolamide of oleic acid.
Claim 7
Independent Claim
101 words
A method for stimulating the production of fluids from a subterranean formation, at least part of which is soluble in acid at the temperature of the formation, which comprises contacting said formation with a retarded acidizing emulsion comprising an aqueous acidizing solution dispersed in oil, said emulsion containing by weight of said emulsion, from about 0.01 to about 10 percent a primary C 8 to C 18 alkyl amine and from about 0.85 to about 2 parts of at least one diethanolamide of at least one C 8 to C 18 fatty acid, per part by weight of said primary amine.
Claim 8
Independent Claim
101 words
A method for stimulating the production of fluids from a subterranean formation, at least part of which is soluble in acid at the temperature of the formation, which comprises contacting said formation with a retarded acidizing emulsion comprising an aqueous acidizing solution dispersed in oil, said emulsion containing by weight of said emulsion, from about 0.01 to about 10 percent a primary C 8 to C 18 alkyl amine and from about 0.85 to about 2 parts of at least one diethanolamide of at least one C 8 to C 18 fatty acid, per part by weight of said primary amine.
Claim 9
Dependent Claim
17 words
The method of claim 6 wherein said amine comprises about 0.05-0.5 percent by weight of said emulsion.
Claim 10
Dependent Claim
12 words
The method of claim 7 wherein said amine is cocoamine or dodecylamine.
Claim 11
Dependent Claim
28 words
The method of claim 6 wherein from about 1 to about 1.6 parts by weight of said diethanolamide is employed per part by weight of said primary amine.
Claim 12
Dependent Claim
19 words
The method of claim 9 wherein the diethanolamide is the diethanolamide of at least one C 18 fatty acid.
Claim 13
Dependent Claim
28 words
The method of claim 10 wherein the primary amine is cocoamine or dodecylamine, and said amine comprises from about 0.05 to about 0.5 weight percent of said emulsion.
Claim 14
Dependent Claim
13 words
The method of claim 6 wherein the acidizing solution is an HCl solution.
Claim 15
Dependent Claim
16 words
The method of claim 12 wherein the acidizing solution is greater than 15 weight percent HCl.
Claim 16
Dependent Claim
16 words
The method of claim 13 wherein the acidizing solution is greater than 25 weight percent HCl.
Claim 17
Dependent Claim
19 words
The method of claim 6 wherein the emulsion comprises about 5 to about 95 percent by volume liquid hydrocarbon.
Claim 18
Dependent Claim
15 words
The method of claim 15 wherein the emulsion comprises about 10-50 volume percent liquid hydrocarbon.
Claim 19
Dependent Claim
15 words
The method of claim 16 wherein the emulsion comprises about 25-35 volume percent liquid hydrocarbon.
Claim 20
Dependent Claim
55 words
The method of claim 6 wherein the emulsion consists substantially of: about 25-35 volume percent kerosene; about 75-65 volume percent aqueous HCl having a concentration greater than 15 weight percent HCl; about 0.05-0.5 weight percent cocoamine or dodecylamine; and about 1-1.6 parts by weight of the diethanolamide of oleic acid per part of said amine.
Claim 21
Dependent Claim
16 words
The method of claim 18 wherein the concentration of HCl is greater than 25 weight percent.
Claim 22
Dependent Claim
15 words
The method of claim 18 wherein the temperature of the formation is about 150°-250° F.
Claim 23
Dependent Claim
17 words
The method of claim 6 wherein the temperature of the formation is at least about 150° F.
Claim 24
Dependent Claim
23 words
The method of claim 6 wherein the emulsion is injected into the formation at a rate and pressure sufficient to fracture said formation.
Claim 25
Dependent Claim
93 words
In a composition for acidizing a subterranean formation, said composition being of the aqueous acidizing solution-in-oil emulsion type containing an effective amount of an alkyl C 8 to C 18 primary amine to reduce the normal reaction rate of said emulsion, the improvement which comprises: in said emulsion, an effective amount of at least one diethanolamide of at least one C 8 to C 18 fatty acid so that said emulsion substantially completely breaks when the acidizing capacity of the emulsion becomes substantially spent as a result of reaction with such a formation.
Claim 26
Dependent Claim
93 words
In a composition for acidizing a subterranean formation, said composition being of the aqueous acidizing solution-in-oil emulsion type containing an effective amount of an alkyl C 8 to C 18 primary amine to reduce the normal reaction rate of said emulsion, the improvement which comprises: in said emulsion, an effective amount of at least one diethanolamide of at least one C 8 to C 18 fatty acid so that said emulsion substantially completely breaks when the acidizing capacity of the emulsion becomes substantially spent as a result of reaction with such a formation.
Claim 27
Dependent Claim
21 words
The composition of claim 23 wherein the amine is dodecylamine or cocoamine and the amide is the diethanolamide of oleic acid.
Claim 28
Dependent Claim
12 words
The composition of claim 23 wherein the acid solution is aqueous HCl.
Claim 29
Dependent Claim
30 words
The composition of claim 25 wherein the concentration of the HCl in the acid solution is greater than 25 percent by weight of the acid solution phase of the emulsion.
Claim 30
Dependent Claim
21 words
The composition of claim 26 wherein the amine is dodecylamine or cocoamine and the amide is the diethanolamide of oleic acid.
Claim 31
Dependent Claim
85 words
A retarded acidizing emulsion suitable for use in methods for increasing the permeability of at least partially acid soluble subterranean formations, comprising: an aqueous acidizing solution dispersed in oil, said emulsion containing by weight of said emulsion, from about 0.01 to about 10 percent a primary C 8 to C 18 alkyl amine and from about 0.85 to about 2 parts of at least one diethanolamide of at least one C 8 to C 18 fatty acid, per part by weight of said primary amine.
Claim 32
Dependent Claim
85 words
A retarded acidizing emulsion suitable for use in methods for increasing the permeability of at least partially acid soluble subterranean formations, comprising: an aqueous acidizing solution dispersed in oil, said emulsion containing by weight of said emulsion, from about 0.01 to about 10 percent a primary C 8 to C 18 alkyl amine and from about 0.85 to about 2 parts of at least one diethanolamide of at least one C 8 to C 18 fatty acid, per part by weight of said primary amine.
Claim 33
Dependent Claim
17 words
The emulsion of claim 28 wherein said amine comprises about 0.05-0.5 percent by weight of said emulsion.
Claim 34
Dependent Claim
12 words
The emulsion of claim 29 wherein said amine is cocoamine or dodecylamine.
Claim 35
Dependent Claim
28 words
The emulsion of claim 28 wherein from about 1 to about 1.6 parts by weight of said diethanolamide is employed per part by weight of said primary amine.
Claim 36
Dependent Claim
19 words
The emulsion of claim 31 wherein the diethanolamide is the diethanolamide of at least one C 18 fatty acid.
Claim 37
Dependent Claim
28 words
The emulsion of claim 32 wherein the primary amine is cocoamine or dodecylamine, and said amine comprises from about 0.05 to about 0.5 weight percent of said emulsion.
Claim 38
Dependent Claim
13 words
The emulsion of claim 28 wherein the acidizing solution is an HCl solution.
Claim 39
Dependent Claim
16 words
The emulsion of claim 34 wherein the acidizing solution is greater than 15 weight percent HCl.
Claim 40
Dependent Claim
16 words
The emulsion of claim 35 wherein the acidizing solution is greater than 25 weight percent HCl.
Claim 41
Dependent Claim
19 words
The emulsion of claim 28 wherein the emulsion comprises about 5 to about 95 percent by volume liquid hydrocarbon.
Claim 42
Dependent Claim
15 words
The emulsion of claim 37 wherein the emulsion comprises about 10-50 volume percent liquid hydrocarbon.
Claim 43
Dependent Claim
15 words
The emulsion of claim 38 wherein the emulsion comprises about 25-35 volume percent liquid hydrocarbon.
Claim 44
Dependent Claim
54 words
The emulsion of claim 28 wherein the emulsion consists substantially of: about 25-35 volume percent kerosene; about 75-65 volume aqueous HCl having a concentration greater than 15 weight percent HCl; about 0.05-0.5 weight percent cocoamine or dodecylamine; and about 1-1.6 parts by weight of the diethanolamide of oleic acid per part of said amine.
Claim 45
Dependent Claim
16 words
The emulsion of claim 40 wherein the concentration of HCl is greater than 25 weight percent.
References Cited (Backward Citations)
US2050932A
Cited
US2802531A
Cited
US3044549A
Cited
US3319714A
Cited
US3353603A
Cited
US3962101A
Cited
US3962102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |