US4493775A
Expired / Lapsed
US
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Method and composition for corrosion
Assignee: Schlumberger Technology Corp
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Filing: 1983-09-30
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Granted: 1985-01-15
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Expires: 2003-09-30
Abstract
Abstract An improved composition for inhibiting the corrosion of ferrous metals in acidic environments, especially in the presence of H2S.
Inventors
- 👤 M. Dewayne Coffey
- 👤 Mary Y. Kelly
- 👤 Weldon C. Kennedy, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:08
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/54; C23; C23F; C23F11/00; C23F11/04; Y; Y10; Y10S; Y10S166/00; Y10S166/902; Y10S507/00; Y10S507/933; Y10S507/934
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
156 words
A corrosion inhibitor composition comprising: (A) The product of the reaction of (1) cyclohexylamine or an inertly-substituted derivative thereof, a salt of either of these, or mixtures thereof, with (2) per mole of component (1), greater than about 10 moles of formaldehyde or an amount of paraformaldehyde which is sufficient to release greater than about 10 moles of formaldehyde, or a mixture thereof, and (3) acetophenone, an inertly-substituted derivative thereof, or a mixture thereof, in an amount which is from about 3 moles per mole of component (A) (1) to an amount which is about equimolar to component (A) (2), and (4) from zero to about 10 weight percent, based on the sum of the weights of components (A) (1), (A) (2) and (A) (3), of at least one aliphatic carboxylic acid having from 1 to about 20 carbon atoms; and (B) a combination of (1) at least one acetylenic alcohol, and (2) additional, unreacted formaldehyde.
Claim 2
Dependent Claim
156 words
A corrosion inhibitor composition comprising: (A) The product of the reaction of (1) cyclohexylamine or an inertly-substituted derivative thereof, a salt of either of these, or mixtures thereof, with (2) per mole of component (1), greater than about 10 moles of formaldehyde or an amount of paraformaldehyde which is sufficient to release greater than about 10 moles of formaldehyde, or a mixture thereof, and (3) acetophenone, an inertly-substituted derivative thereof, or a mixture thereof, in an amount which is from about 3 moles per mole of component (A) (1) to an amount which is about equimolar to component (A) (2), and (4) from zero to about 10 weight percent, based on the sum of the weights of components (A) (1), (A) (2) and (A) (3), of at least one aliphatic carboxylic acid having from 1 to about 20 carbon atoms; and (B) a combination of (1) at least one acetylenic alcohol, and (2) additional, unreacted formaldehyde.
Claim 3
Dependent Claim
13 words
A composition of claim 1 further comprising a C 1 -C 4 alkanol.
Claim 4
Dependent Claim
10 words
A composition of claim 2 further comprising a nonionic surfactant.
Claim 5
Dependent Claim
10 words
A composition of claim 1 further comprising a nonionic surfactant.
Claim 6
Dependent Claim
22 words
A composition of claim 1 wherein component (A) (1) is cyclohexylamine, component (A) (2) is paraformaldehyde, and component (A) (3) is acetophenone.
Claim 7
Dependent Claim
13 words
A composition of claim 5 wherein the aliphatic carboxylic acid is tall oil.
Claim 8
Dependent Claim
17 words
A composition of claim 1 wherein component (A) is produced in the presence of an acid catalyst.
Claim 9
Dependent Claim
23 words
A composition of claim 1 wherein component (A) is produced at a reaction temperature of from about 150° F. to about 250° F.
Claim 10
Dependent Claim
14 words
A composition of claim 1 wherein the amount of aliphatic carboxylic acid is zero.
Claim 11
Dependent Claim
25 words
A composition of claim 1 wherein from about 11 to about 15 moles of component (A) (2) are employed per mole of component (A) (1).
Claim 12
Dependent Claim
25 words
A composition of claim 1 wherein from about 4 to about 8 moles of component (A) (3) are employed per mole of component (A) (1).
Claim 13
Dependent Claim
21 words
A composition of claim 1 wherein the amount of free formaldehyde is at least about 4 weight percent of the composition.
Claim 14
Dependent Claim
23 words
A composition of claim 1 wherein the amount of acetylenic alcohol is from about 1 to about 30 volume percent of the composition.
Claim 15
Dependent Claim
23 words
A composition of claim 1 wherein the amount of free formaldehyde is from about 5 to about 20 weight percent of the composition.
Claim 16
Dependent Claim
185 words
A composition of claim 1 comprising: (A) the product of the reaction of (1) cyclohexylamine, a salt thereof, or mixtures thereof, (2) per mole of component (A) (1), an amount of paraformaldehyde which is sufficient to release from about 11 to about 15 moles of formaldehyde, (3) per mole of component (A) (1), from about 4 to about 8 moles of acetophenone, and (4) based on the sum of the weights of components (A) (1-3), from about zero to about 2 weight percent of an aliphatic carboxylic acid or a mixture of aliphatic carboxylic acids; and (B) a combination of (1) an amount of acetylenic alcohol which is from about 5 to about 15 volume percent of the composition, (2) an additional formaldehyde component in an amount which will make the composition have at least about 4 weight percent free formaldehyde, (3) an amount of a C 1 -C 4 alkanol which is from about 5 to about 50 volume percent of the composition, and (4) an amount of a nonionic surfactant which is from about 3 to about 25 volume percent of the composition.
Claim 17
Dependent Claim
170 words
A composition of claim 15 comprising: (A) the product of the reaction, in the presence of a catalytic amount of an acid catalyst at a temperature of from about 150° F. to about 250° F., of (1) cyclohexylamine, (2) per mole of cyclohexylamine, an amount of paraformaldehyde which is sufficient to produce from about 12 to about 13 moles of formaldehyde, (3) per mole of cyclohexylamine, from about 5 to about 6 moles of acetophenone, and (4) tall oil as the aliphatic carboxylic acid; and (B) a combination (1) an amount of ethyl octynol which is from about 5 to about 15 volume percent of the composition, (2) an additional formaldehyde component in an amount which will make the composition have from about 5 to about 20 weight percent free formaldehyde, (3) an amount of isopropanol which is from about 10 to about 15 volume percent of the composition, and (4) an amount of a nonionic surfactant which is from about 10 to about 15 volume percent of the composition.
Claim 18
Dependent Claim
20 words
An inhibited acid composition comprising an aqueous inorganic non-oxidizing acid, and a corrosion-inhibiting amount of a composition of claim 1.
Claim 19
Dependent Claim
24 words
An inhibited acid of claim 17 wherein the composition of claim 1 is from about 0.1 to about 2.0 volume percent of the composition.
Claim 20
Dependent Claim
35 words
In a method of treating a subterranean formation penetrated by a wellbore by injecting an acid through the wellbore and into said formation, the improvement comprising employing as the acid a composition of claim 17.
Claim 21
Dependent Claim
19 words
A method of claim 19 for acidizing oil or natural gas wells to enhance the production of formation fluids.
Claim 22
Dependent Claim
23 words
A method of claim 20 for acidizing sour oil or sour gas wells comprising employing as the acid the composition of claim 18.
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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) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |