US4609475A
Expired / Lapsed
US
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Method of improving the permeability of a subterranean formation by removal of polymeric materials therefrom
Assignee: Halliburton Co
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Filing: 1984-02-24
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Granted: 1986-09-02
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Expires: 2004-02-24
Abstract
Abstract A composition for and method of removing polymeric material from a porous media such as a subterranean formation. The method comprises contacting the polymeric material with an aqueous composition having a pH of from about 2 to about 10 and comprising an oxidizing agent, a water soluble carboxylic acid, and optionally, a source which is effective in promoting the decomposition of the oxidizing agent.
Inventors
- 👤 David J. Hanlon
- 👤 J. Michael Wilson
- 👤 Jimmie D. Weaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:44
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/52; Y; Y10; Y10S; Y10S507/00; Y10S507/921
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
139 words
A method of solubilizing polymeric material which has been deposited in a porous media comprising: contacting the material with an aqueous composition having a pH of from about 2 to about 10 and comprising: (a) a water soluble carboxylic acid selected from the group consisting of formic acid, acetic acid, propionic acid, butyric acid, lactic acid, glycolic acid, citric acid and mixtures thereof; and, (b) an oxidizing agent selected from the group consisting of sodium perborate, hydrogen peroxide, an alkali metal peroxide, sodium carbonate peroxydihydrate, sodium peroxydiphosphate, potassium peroxydiphosphate, potassium carbonate peroxydihydrate, and mixtures thereof; (c) a source effective in promoting the decomposition of the oxidizing agent and selected from the group consisting of ethyl alcohol, methyl alcohol, propyl alcohol, n-butyl alcohol, isopropyl alcohol, isoamyl alcohol, ethylene glycol, diacetone alcohol, cuprous ions, ferrous ions, cobalt ions, and mixtures thereof.
Claim 2
Independent Claim
139 words
A method of solubilizing polymeric material which has been deposited in a porous media comprising: contacting the material with an aqueous composition having a pH of from about 2 to about 10 and comprising: (a) a water soluble carboxylic acid selected from the group consisting of formic acid, acetic acid, propionic acid, butyric acid, lactic acid, glycolic acid, citric acid and mixtures thereof; and, (b) an oxidizing agent selected from the group consisting of sodium perborate, hydrogen peroxide, an alkali metal peroxide, sodium carbonate peroxydihydrate, sodium peroxydiphosphate, potassium peroxydiphosphate, potassium carbonate peroxydihydrate, and mixtures thereof; (c) a source effective in promoting the decomposition of the oxidizing agent and selected from the group consisting of ethyl alcohol, methyl alcohol, propyl alcohol, n-butyl alcohol, isopropyl alcohol, isoamyl alcohol, ethylene glycol, diacetone alcohol, cuprous ions, ferrous ions, cobalt ions, and mixtures thereof.
Claim 3
Dependent Claim
31 words
The method recited in claim 1 wherein said carboxylic acid is selected from the group consisting of citric acid, acetic acid, and mixtures thereof and said oxidizing agent is sodium perborate.
Claim 4
Dependent Claim
49 words
The method recited in claim 2 wherein said acid is present in the range of from about 2.0 to about 20.0 percent by weight of the composition and said oxidizing agent is present in the range of from about 2.0 to about 20.0 percent by weight of the composition.
Claim 5
Dependent Claim
15 words
The method recited in claim 2 wherein the pH of said composition is about 4.
Claim 6
Dependent Claim
32 words
The method recited in claim 2 wherein said porous media is a subterranean formation and said polymeric material is selected from the group consisting of polyacrylamide, polyacrylic acid, polysaccharide, and mixtures thereof.
Claim 7
Independent Claim
147 words
A method for increasing the permeability of a porous media which has its permeability decreased by the deposition of polymeric materials comprising: contacting the media with an aqueous composition having a pH of from about 2 to about 10 and comprising: (a) a water soluble carboxylic acid selected from the group consisting of formic acid, acetic acid, propionic acid, butyric acid, lactic acid, glycolic acid, citric acid and mixtures thereof; and, (b) an oxidizing agent selected from the group consisting of sodium perborate, hydrogen peroxide, an alkali metal peroxide, sodium carbonate peroxydihydrate, sodium peroxydiphosphate, potassium peroxydiphosphate, potassium carbonate peroxydihydrate, and mixtures thereof; and (c) a source effective in promoting the decomposition of the oxidizing agent and selected from the group consisting of ethyl alcohol, methyl alcohol, propyl alcohol, n-butyl alcohol, isopropyl alcohol, isoamyl alcohol, ethylene glycol, diacetone alcohol, cuprous ions, ferrous ions, cobalt ions, and mixtures thereof.
Claim 8
Independent Claim
147 words
A method for increasing the permeability of a porous media which has its permeability decreased by the deposition of polymeric materials comprising: contacting the media with an aqueous composition having a pH of from about 2 to about 10 and comprising: (a) a water soluble carboxylic acid selected from the group consisting of formic acid, acetic acid, propionic acid, butyric acid, lactic acid, glycolic acid, citric acid and mixtures thereof; and, (b) an oxidizing agent selected from the group consisting of sodium perborate, hydrogen peroxide, an alkali metal peroxide, sodium carbonate peroxydihydrate, sodium peroxydiphosphate, potassium peroxydiphosphate, potassium carbonate peroxydihydrate, and mixtures thereof; and (c) a source effective in promoting the decomposition of the oxidizing agent and selected from the group consisting of ethyl alcohol, methyl alcohol, propyl alcohol, n-butyl alcohol, isopropyl alcohol, isoamyl alcohol, ethylene glycol, diacetone alcohol, cuprous ions, ferrous ions, cobalt ions, and mixtures thereof.
Claim 9
Dependent Claim
31 words
The method recited in claim 6 wherein said carboxylic acid is selected from the group consisting of citric acid, acetic acid, and mixtures thereof and said oxidizing agent is sodium perborate.
Claim 10
Dependent Claim
49 words
The method recited in claim 7 wherein said acid is present in the range of from about 2.0 to about 20.0 percent by weight of the composition and said oxidizing agent is present in the range of from about 2.0 to about 20.0 percent by weight of the composition.
Claim 11
Dependent Claim
15 words
The method recited in claim 8 wherein the pH of said composition is about 4.
Claim 12
Dependent Claim
32 words
The method recited in claim 9 wherein said polymeric material is selected from the group consisting of polyacrylamide, polyacrylic acid, polysaccharide, and mixtures thereof and said porous media is a subterranean formation.
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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) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |